"ks" wrote...
Arbor and nut need cleaning or threads need to be restored.


What ks said - you need to chase the threads on the nut and the arbor
spindle; lotsa luck finding left-hand metric taps and dies. Might be easier
to order a new nut from JET and dress the arbor threads with a thread file.
Then put a little never-seize on it.

Be sure you haven't been over-tightening the nut - just snug 'er down,
that's all. It's real easy to over-torque a nut or bolt with never-seize on
it - it's a thread lubricant.

--
Timothy Juvenal
www.rude-tone.com/work.htm