Spencer Chase wrote in 070819 MMDigest:

> I never had any luck with Liquid Wrench on pot metal but
> there is a penetrating oil that might work.

Google on "Kano Labs" and you should find it.  This stuff _works!_
I've used it for disassembly of everything from large 19th century
machine tools to small clockworks, and used it to disassemble the
frozen roll motor of a slightly damp Beckwith (Sears) player.
Good stuff!

Bob Loesch