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Replace the focuser. Buy yourself the best Crayford you can afford. Pure and simple. Will change your life
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Or for only $95 get yourself an Orion Accufocus to motorise your R&P, IMHO this is even better than a crayford since you don't have to touch the scope while focusing so you get very fine focus with no annoying vibration.. also, in winter you can keep your hands in your pockets while focusing