I have a couple of J-heads. Recently, I took the motor off one and tried it on
the other (to see how quiet the other one ran with a known-good motor). Then I
put it back onto the head it came from, the one on my mill. Problem now is, I
can't seem to get the clamping screws adjusted so that they stay put when I
loosen/tighten the levers to change belt speeds. They worked fine beforehand,
and I didn't change any of the hardware. I must be doing something wrong, but I
can't figure out what. I don't want to have to use two hands to do this. Anyone?

GWE