I used to service the locks at a hotel, that used Lock Ease
Graphited Lock Fluid. That awful black crap caused more
problems than the tenants. Dried up, and got sticky.

As to the plastic piece, someone has to take the lock apart
to get the piece out.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
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wrote in message
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Adding acetone will make a nice glue...to make things worse!
Try "Lock-Ease" and the key...and work it in.