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Raymo, are there any movement in the RA and Dec axis when they are locked down? If so, then you will need to adjust for the mesh between the gears and the worm via the thruster bearings.
Does the cracking noise happen when there is no load and when you speed up the slewing? Again, I'd be looking at the interface between the gears and th worm as the first culprit.
Failing that, strip down the mount and inspect the tapered bearings on both axis and also check out if the shims are worn out.
Good luck
Bo
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