My Bosch 1617 has a little ‘tight spot’ midway on the shaft threads that I have to ‘get by’ with the wrenches each time I tighten a bit before doing the final snugging. Happens on both collets. Not a problem, not getting worse but not ideal either. If I could afford (and I can) a Musclechuck, it would eliminate the problem, which threading and unthreading anything is bound to create at some point. Eventually, safety drives us to make our tools work correctly before a catastrophe, which a router would be a candidate.
Common Man Woodworking