[john walker's workshop]

if you have 1/4" you are lucky. the case should be heated as normal with an oxy/acetylene torch. i've had good luck getting these out by getting a real good, TIGHT grip with large visegrips. trouble is, you have to clear out the upper studs and case thru-bolts and nuts that are in the way of swinging the visegrips, so you don't have to release and reclamp the stud continuously. also be careful not to gouge the cylinder base as you turn the visegrips. heat well, until you feel the stud start to turn, then keep the heat on the case for a while as you slowly turn it out. try to position the visegrips so you can get largest the swing before you hit something with their handles. if you could put the visegrips on a slight angle, you may not have to ever remove and reclamp. a hot case is the ticket.