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Old 19-11-2022, 06:11 AM
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multiweb (Marc)
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Join Date: Oct 2007
Location: Sydney
Posts: 22,080
Yes Louie's on the money. That is glass pinched. If it's not the clips on your primary then it is the silicone pulling at the back of your secondary. Cut it off with a stanley knife then clean it out. Put 3 dabs at 120 degrees on an ellipse at 75% from the center of the secondary. Put the mirror face down on a flat surface. Get a wooden paddle pop stick as a spacer and rest the aluminium cylinder onto the silicone and let it cure. When it cures it will shrink, pull and jam the wood spacer. Slide it off to release the pressure and you'll be good to go.

PS: make sure to make a note of the secondary offset before re gluing.
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