Hi Larry,
I have a proceedure for getting stuck pistons out of frozen wheel
cylinders.  Works for double or single cyls.  I take bleeder and grind off
the seating end, and cut off the other end so Now it looks kile a hollow
nut.  Tap the cut off top end to 1/4 28 SAE bolt size, screw a grease
fitting into it.  Thread it into the bleede hole and now put a grease gun
on it and pump away.  I've broken loose everyone I've needed to this way. 
Cheap and simple.  With a double cyl., you get out one piston, clean out
the grease, cups and springs and you now have access to the second piston
to pound it out with a soft drift and a BFH.
Good luck, Paul A
 
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