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No one else has jumped in and I know how frustrating that can be.
I know nothing of your system but you've mentioned paper ring spacers, could you use a slightly thicker paper spacer or would that cause focus and collimation issues?
I was going to suggest 3M double sided tape but while that's extremely thin and used on my GSO Newt secondary I don't think it would be ideal on a glass corrector plate.
Perhaps fibre washers could replace the paper spacers and be just that little bit thicker than paper without doing any damage or messing with focus and collimation.
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