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I appreciate the advice, I did try locking an outer nut against it but figured it loosened since in practice the extruder locked up, and in theory during forward rotation the large gear would want to break away from it by moving toward the extruder. It'd be difficult to tighten an inner nut against it given the narrow space. Maybe I have a different problem, but I can't imagine why else it would extrude normally for several minutes and then become slower and then refuse to move at all?