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Collimation ring
Haven't seen the article, but assume it involves putting a small circle in the middle of the mirror to assist in collimation. I have a ring hole binder reinforcement ring ( about 7mm diam, 3-4mm central hole) on ALL my mirrors, I'd be lost without it. Using the Cheshire eyepiece its easy to achieve success.
Recommend it to everyone with a reflector.
( If you ever need to re-aluminise the mirror it will come off during the normal cleaning process)
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