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It is really hard to over tighten with Bob's knobs. The little plastic shims prevent overtightening and the screws need to be firm enough that they will not move and not so tight that you cannot move them at all.
Glad to here that you got the scope collimated and just remember to continue to collimate your scope each time you move it. Doing this will increase you skills and keep your scope in fine collimation.
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