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Hi Greg, thanks for replying.
I've got the grey belts, poly with kevlar, no black residue - however that is something I did when I had the drives off for re-greasing (as in cleaning the teeth).
Funny thing is that I've loosened the cam lock screw again since then and the pin does not pop up, as in I cannot push it down any further. However, I understand what you are saying about it tending to pop up from time to time and will keep an eye out for it.
Yes, the centroid of the star is oscillating left and right in my tracking image, it's not moving up or down very much (although the other night the wind was not helping me) but on good nights it's very stable in DEC and flopping around in RA (I think that's right - not in front of the latest log so I could have those reversed).
Thank you for describing what those grub screws are for. I'll have a go at those and see if it makes a good change.
Simon.
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