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For those that asked for pictures, here you go. Stellarvue asked me to send them so they can attempt to troubleshoot.
I also have some more info:
Ignoring the fine focus knob, I can get a reasonably smooth setting on the coarse focus knobs, but even here there is a mild 'sticking' once every turn. The fine focus continues to 'bump' three times per turn.
Looking carefully at the part that contains the bearings it looks to me as if the axis of rotation is slightly out of alignment, which would seem to explain the grinding issues. I can't see any way to adjust the alignment and have not tried to do so. There is nothing that is obviously 'bent'.
Anyone know if Bintel can deal with this? I forgot to call them today.
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