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Originally Posted by elusiver
i wouldda thought a little section of felt padding right behind where the centre spot is would do the trick, as that's out be the thinnest part of the mirror bearing the most weight.
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I think that is the last place to put a support because of the same reason. As its the thinnest part of the mirror it can be pushed "out" easiest. Its for this reason that the mirror is supported in a ring about 70% of the diameter becauses the narrow, thick outer circle balances the wide, thin inner circle and causes the least flexition of the mirror.
If you are using felt and not glue give it a try, it won't hurt anything except that you will have to recollimate the scope again.