When I bought my scope I checked how the mirror clips had been tightened from the factory. Interestingly, one screw on each clip was quite tight and the other very loose, so that the rubber clips were bearing down on the mirror at an angle.
A lot of the information I found stated that the clips should not touch the mirror, but just sit a fraction of a mm above it to prevent it from falling out of the mirror cell.
I hope that is correct, because that is how I've set my mirror clips.
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