What I have done with the lock collars is lightly set the set screw on to the shaft when everything is in place that way you know wear it is on the shaft, then take it all back apart and take a drill and drill into the shaft a little so the set screw goes in deeper and does not leave a ridge like when tighten to just the shaft, that way you can get the shaft out easily done the road. You could put a flat spot on the shaft if you do not want to drill it. I prefer drilling it a little.