Unsticking a Seagate ST-419 head

[Al Kossow]

I have a couple of drives I would really like to recover the data from.
On one of the two I've tried so far, the lowest head in the stack is really 
stuck on.
Has anyone successfully unstuck a head from this era. I've tried the obvious 
things
(gentle rotation in both axis, heating the platters) but there is a lot of 
surface
area on those old heads and it is pretty badly stuck.