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I've had a look - those screws (other than the locking screw) are in very tight, and I am not sure if I can unscrew them without threading them.
This does seem to point towards this being the problem - if they are all in too tight, then it makes sense it is a bit harder to turn the wheels than it should.
I'm a bit wary of putting WD40 on it, I have heard it can get into the optics eventually if it gets into the focuser.
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