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Yep, coarse focus with the original and lock the mirror if you are lucky enough to have mirror locks then fine focus with the crayford or whatever else you have. I have a Meade zero image shift focuser here that I swapped (Plus a factory Celestron focus knob) for my feathertouch with another member on here. It has maybe 15mm of travel so you rough focus with the original then fine with the other.
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