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Any pressure even slightly applied on a mirror whether it's mirror clips on a primary or glue on the back of a secondary holder will introduce aberrations such as astigmatism and other deformations in star shapes. So I'm with Brendan on this one. Pack, shim all you want but don't tighten. Use cork or paper not aluminum. Things move with temperature and need a bit of room to expand and contract. Cork is good.
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