Originally Posted by MushCreek
I wouldn't try to stretch the Arctic lid- it would be too hard to do it cleanly. I was thinking of trying instead to pound the bead of the drum inward with a BFH. Since my drum is sealed, I could pound on it pretty hard. Once it's cut, it wouldn't work.
I would suggest doing it after you cut it. If you do it before you cut, there's a lack of mass on the inside of the rim to help direct the force and you risk crimping the rim or just deforming it.