I would be might pissed off if I bought a professionally made scope and found out when I used it that it would not stay collimated because of a poorly designed / engineered mirror cell .... this is something the manufacturers have to get right else their reputation for quality will go around the S-bend with the next flush.
Why should the customer have to modify a scope (at their cost) to fix a problem the manufacturer should have sorted out in the first place ?
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