[rblong]

get some wd40 around the skirt and let it sit - for days - freshening wd40 every so often. Heat piston a few times in between, but always let cool completely before you try and drive out from underneath. I might even smack it a little fom top to get it broken loose - then more wd40. May be newer better ways, but this has worked for me. Hope fully the rings have not caused so much damage by rusting into block that it can't be bored!