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Totally agree , invest in a descent focuser of the Crayford design.
It's going to cost a bit and a motorised one even more but you will appreciate a good focuser .
Trying to motorise a rack and pinion could be done and most probably has , but they still suffer the rock and roll in the draw tube, and the reduction is coarse as compared to a Crayford design.
I don't think there is much point in going motorised when you still have to be hands on to push the tube.
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