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I'll have to come to the defence of the poor rack and pinion here.It's not the design that sux ,its the quality of those fitted to a lot of mass produced scopes that gives them a bad reputation.
Though I wouldnt buy a new rack and pinion focuser these days,the cost difference doesnt justify buying one, I have 2 scopes fitted with quality focusers of this design and they perform brilliantly.No slop,smooth and easy to focus.
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