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Optical Tube Rings for Telescopes at Astronomics | Astronomics.com
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Tube Rings - Mounts, Tripods & Accessories | AgenaAstro.com
Tube Rings - Mounts, Tripods & Accessories | AgenaAstro.com
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AstroGoods: Clamshell Rings for Dobsonains and Equatorial Heads
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GSO Telescope Tube Mounting Rings (Set of 2) - 303mm (11.93")
