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I just disassembled and tuned up an old WO 4" Crayford which was slipping in two places. The drawtube was slipping past the pinion - there's a tension screw over the pinion to apply extra pressure. After that the drawtube would still roll out until I added tension to the micro focuser - there's a nut that can be tightened to apply more pressure to the micro focuser bearing. The focuser now holds a 2" diagonal and the heaviest eyepieces.
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