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Mounting Hardware

Flexure is invisible until you see it in your stars. A dovetail that shifts a fraction of a millimetre under load, a guide scope on a soft bracket, a saddle clamping on one point instead of a face — each produces elongation that no processing corrects. David Astro carries mounting hardware items in Canada: dovetail bars and clamps, tube rings, saddles, side-by-side plates and adapter plates, in Canadian stock.

Getting this right is mostly a matter of matching standards and eliminating single points of contact. Tell us your tube diameter, mount saddle and payload and we will specify hardware that holds it rigidly.

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CA$84.00 - CA$84.00
CA$84.00
CA$84.00 - CA$84.00
CA$84.00

Pegasus Universal Single Clamp

PEG-USCLAMP
4 in stock

Securely Mounts the Ultimate Powerbox v3 Dual Vixen & Losmandy 3" Dovetail Compatibility Includes 4x M3 Screws for Direct Attachment Streamlin...

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CA$84.00 - CA$84.00
CA$84.00
CA$84.00 - CA$84.00
CA$84.00
CA$315.00 - CA$315.00
CA$315.00
CA$315.00 - CA$315.00
CA$315.00

PrimaLuceLab 100mm PLUS Support Rings

PLL-PLLANSU100P

Designed for 100mm Diameter Optical Tubes Part of the Modular PrimaLuceLab PLUS System Precision CNC-Machined from a Single Aluminum Block Hard An...

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CA$315.00 - CA$315.00
CA$315.00
CA$315.00 - CA$315.00
CA$315.00
CA$329.00 - CA$329.00
CA$329.00
CA$329.00 - CA$329.00
CA$329.00

PrimaLuceLab 105mm PLUS Support Rings

PLL-PLLANSU105P

105mm Internal Diameter Prima Luce Universal System (PLUS) Compatible High-Precision CNC-Machined Aluminum Construction Hard Anodized Finish for D...

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CA$329.00 - CA$329.00
CA$329.00
CA$329.00 - CA$329.00
CA$329.00
CA$343.00 - CA$343.00
CA$343.00
CA$343.00 - CA$343.00
CA$343.00

PrimaLuceLab 115mm PLUS Support Rings

PLL-PLLANSU115P

Designed for 115mm diameter optical tubes Part of the modular PrimaLuceLab PLUS system CNC-machined from a single block of aluminum Hard-anodized ...

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CA$343.00 - CA$343.00
CA$343.00
CA$343.00 - CA$343.00
CA$343.00
CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00

PrimaLuceLab 125mm PLUS Support Rings

PLL-PLLANSU125P

125mm Internal Diameter PrimaLuceLab PLUS System Integration CNC-Machined Aluminum Construction Hard-Anodized Finish Optimized for Takahashi FSQ10...

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CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00
CA$399.00 - CA$399.00
CA$399.00
CA$399.00 - CA$399.00
CA$399.00

PrimaLuceLab 131mm PLUS Support Rings

PLL-PLLANSU131P

Internal Diameter: 131mm Material: CNC-machined from a single block of aluminum System Compatibility: Part of the PrimaLuceLab PLUS modular system...

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CA$399.00 - CA$399.00
CA$399.00
CA$399.00 - CA$399.00
CA$399.00
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00

PrimaLuceLab 134mm PLUS Support Rings

PLL-PLLANSU134P

Designed for 134mm Diameter Optical Tubes Part of the PrimaLuceLab PLUS Modular System CNC-Machined from a Solid Block of Aluminum Hard Anodized F...

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CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

PrimaLuceLab 140mm PLUS Support Rings

PLL-PLLANSU140P

Securely holds optical tubes with a 140mm diameter CNC machined from a solid aluminum block for maximum rigidity Part of the modular PrimaLu...

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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$441.00 - CA$441.00
CA$441.00
CA$441.00 - CA$441.00
CA$441.00

PrimaLuceLab 145mm PLUS Support Rings

PLL-PLLANSU145P

145mm Internal Diameter PrimaLuceLab PLUS System Integration CNC-Machined Aluminum Construction Hard Anodized Finish Universal Hole and Slot Patte...

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CA$441.00 - CA$441.00
CA$441.00
CA$441.00 - CA$441.00
CA$441.00
CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00

PrimaLuceLab 150mm PLUS Support Rings

PLL-PLLANSU150P

Fits 150mm Diameter Optical Tubes Precision CNC-Machined Aluminum Construction Part of the Modular PrimaLuceLab PLUS System Universal Hole and Slo...

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CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00
CA$469.00 - CA$469.00
CA$469.00
CA$469.00 - CA$469.00
CA$469.00

PrimaLuceLab 155mm PLUS Support Rings

PLL-PLLANSU155P

Internal Diameter: 155mm Compatible with Takahashi FS-152 and TOA-130 refractors Part of the PrimaLuceLab PLUS modular system CNC machined from a ...

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CA$469.00 - CA$469.00
CA$469.00
CA$469.00 - CA$469.00
CA$469.00
CA$483.00 - CA$483.00
CA$483.00
CA$483.00 - CA$483.00
CA$483.00

PrimaLuceLab 168mm PLUS Support Rings

PLL-PLLANSU168P

Designed for optical tubes with a 168mm diameter Part of the PrimaLuceLab PLUS modular mounting system Precision CNC-machined from a single alumin...

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CA$483.00 - CA$483.00
CA$483.00
CA$483.00 - CA$483.00
CA$483.00
CA$497.00 - CA$497.00
CA$497.00
CA$497.00 - CA$497.00
CA$497.00

PrimaLuceLab 180mm PLUS Support Rings

PLL-PLLANSU180P

180mm Internal Diameter Compatible with Takahashi TOA150 and similar OTAs PrimaLuceLab PLUS System Integration CNC-Machined from a Single Aluminum...

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CA$497.00 - CA$497.00
CA$497.00
CA$497.00 - CA$497.00
CA$497.00
CA$665.00 - CA$665.00
CA$665.00
CA$665.00 - CA$665.00
CA$665.00

PrimaLuceLab 235mm PLUS Support Rings

PLL-PLLANSU235P

235mm Internal Diameter CNC-Machined Aluminum Construction Hard Anodized for Durability Part of the Modular PLUS System Universal Hole and Slot Pa...

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CA$665.00 - CA$665.00
CA$665.00
CA$665.00 - CA$665.00
CA$665.00
CA$209.00 - CA$209.00
CA$209.00
CA$209.00 - CA$209.00
CA$209.00

PrimaLuceLab 80mm PLUS Support Rings

PLL-PLLANSU80P

80mm Internal Diameter for Compact Refractors and Telescopes CNC-Machined from a Solid Aluminum Block for Maximum Rigidity Part of the PLUS (Prima...

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CA$209.00 - CA$209.00
CA$209.00
CA$209.00 - CA$209.00
CA$209.00
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00

PrimaLuceLab 85mm PLUS Support Rings

PLL-PLLANSU85P

Designed for 85mm Diameter Telescope Tubes High-Precision CNC-Machined Aluminum Construction Hard-Anodized for Durability and Corrosion Resistance...

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CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
CA$287.00 - CA$287.00
CA$287.00
CA$287.00 - CA$287.00
CA$287.00

PrimaLuceLab 90mm PLUS Support Rings

PLL-PLLANSU90P

Fits 90mm Diameter Optical Tubes Part of the Modular PLUS System CNC-Machined Aluminum Construction Weight: 0.5 kg Multiple Threaded Holes and Slo...

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CA$287.00 - CA$287.00
CA$287.00
CA$287.00 - CA$287.00
CA$287.00
CA$301.00 - CA$301.00
CA$301.00
CA$301.00 - CA$301.00
CA$301.00

PrimaLuceLab 95mm PLUS Support Rings

PLL-PLLANSU95P

Internal Diameter: 95mm Material: CNC-machined aluminum Finish: Sandblasted and hard-anodized Mounting System: PrimaLuceLab PLUS Compatible Telesc...

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CA$301.00 - CA$301.00
CA$301.00
CA$301.00 - CA$301.00
CA$301.00
CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00

PrimaLuceLab Big Dovetail Clamp Vixen+Losmandy PLUS

PLL-PLLMORVLPB
2 in stock

Accepts both Vixen and Losmandy-style dovetail plates CNC machined from a single block of aluminum for maximum rigidity Hard-anodized finish for d...

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CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00
CA$95.00 - CA$95.00
CA$95.00
CA$95.00 - CA$95.00
CA$95.00

PrimaLuceLab Dovetail Clamp Vixen+Losmandy PLUS

PLL-PLLMORVLP
3 in stock

Accepts both Vixen-style and Losmandy-style dovetail plates Part of the modular PrimaLuceLab PLUS system High-precision CNC machined from a solid ...

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CA$95.00 - CA$95.00
CA$95.00
CA$95.00 - CA$95.00
CA$95.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

PrimaLuceLab DX Finder Base

PLL-PLLBACEDX
4 in stock

Universal finder base for multiple brands Dual-curvature design fits various telescope tubes Slotted holes for flexible mounting All-metal constru...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$147.00 - CA$147.00
CA$147.00
CA$147.00 - CA$147.00
CA$147.00

PrimaLuceLab Guide Rings PLUS 115mm

PLL-PLLANGU115P

115mm Internal Diameter CNC-Machined Aluminum Construction Hard Anodized Red Finish Part of the PrimaLuceLab PLUS System Designed for Parallel Gui...

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CA$147.00 - CA$147.00
CA$147.00
CA$147.00 - CA$147.00
CA$147.00
CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00

PrimaLuceLab Guide Rings PLUS 80mm

PLL-PLLANGU80P

80mm Internal Diameter PrimaLuceLab PLUS System Compatible CNC-Machined Aluminum Construction Hard-Anodized Finish Three-Point Adjustment Screws w...

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CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

PrimaLuceLab Guide Scope Support for ECCO

PLL-ECCOSUP

Adds a finder or guide scope support to the PrimaLuceLab ECCO Replaces the need for separate guide rings Ideal for small, portable apochromatic re...

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CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

Dovetail Standards and Building a Rigid Connection

Nearly all mounting hardware follows one of two dovetail standards, and mixing them without the correct clamp is the most common cause of a telescope sitting loose on an otherwise good mount.

  • Vixen-style dovetail (approximately 44 mm): The lighter standard, fine for small refractors and visual loads up to a few kilograms.
  • Losmandy-style dovetail (approximately 75 mm): The wider, stiffer standard used for heavier optics and imaging trains where flexure must be minimized.
  • Tube rings: Sized to the tube's outer diameter and lined to protect it; rings allow rotation for framing without unbolting the optic.
  • Mount saddles: The receiving clamp on the mount head. Dual-fit saddles accept both standards, and face-clamping designs grip more securely than a single point screw.
  • Side-by-side plates: Carry two optical tubes on one mount with balance adjustment in both axes.
  • Adapter plates: Convert between standards, add accessory mounting points, or raise a guide scope clear of an obstruction.

Why Choose David Astro for Mounting Hardware

Rigidity is cumulative. Every joint between the optic and the mount either holds or contributes to the error you spend the night chasing.

  • Standard matching: We confirm your mount's saddle type and specify a dovetail that fits it fully, rather than one that seats on an edge.
  • Flexure diagnosis: If your guiding shows drift that guiding corrections cannot fix, we will look at the mechanical chain with you — usually it is a guide scope bracket or an undersized dovetail.
  • Tube diameter fitting: Rings are matched to actual measured outer diameter, since nominal aperture and tube diameter are not the same number.
  • Authorized dealer: Genuine hardware with full manufacturer warranty, shipped from Canadian stock.
  • No cross-border fees: Canadian orders ship domestically with no duties or brokerage charges.

Mounting Hardware in Canada — Frequently Asked Questions

Vixen or Losmandy dovetail?
Losmandy for anything above roughly 7 kg or for imaging where flexure matters. Vixen is adequate for smaller refractors and visual use, and is lighter and more common on entry-level mounts.
Can I put a Vixen bar in a Losmandy saddle?
Only with a dual-fit saddle or an adapter clamp. Forcing a narrow bar into a wide clamp results in point contact, which is exactly the condition that causes slipping under load.
Why do my stars elongate only on one side of a meridian flip?
That pattern usually indicates differential flexure rather than tracking error. Check the guide scope bracket, the dovetail seating and the focuser drawtube, in that order.
How do I size tube rings?
By the tube's outer diameter, not aperture. Measure the tube itself, or tell us the exact telescope model and we will confirm the correct ring size.

Chasing flexure?

Tell us your tube, mount and payload and we will specify hardware that holds it solid. Ships from Canada with expert support.