I had been wanting a non marring attachment for the live center so I bought a 3/4" tap and a piece of UHMW plastice bar that is 1 1/4" diameter. I cut off about 2" , mounted it in a chuck and drill and tapped it. I then mounted it on the center, pinned the center, put some tape over the wire I pinned it with and shaped the end. After removing the tape and pin I decided to try using it.
And here's where the problem occured - apparently when using the live center in the headstock the brass plate on the end (Jet 1642 center) decided to unscrew partially and jammed the center so that it did not turn. Next thing I know I'm smelling burning plastic.
No real damage, I cleaned out the inside where some dust had worked it way in and reassembled the unit. Just a cautionary tale, hopefully there will be no future issues....