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Mine rattles a bit when starting / stopping slewing also. It's normal.
With the tracking, do you have sidereal rate selected? I think it's the default anyway but just check to be sure. Mine takes a couple of minutes to settle, after which the tracking accuracy is very precise.
Mine also tracks quietly on battery power. I have to concentrate to hear the R.A. motor. The DEC stepper can sometimes sit on a spot that gives a high pitch whine, but it's not too bad.
Compared to the racket my previous mounts made, this one is quite pleasant.
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