Hmmm I didn't consider that. May just leave it the way it is. If its not broke don't fix it right?I tried it years ago, and the problem I ran into was that the little threads around the top, which can chip and leave little bits of glass in the beer. I had one crack and two where buddies were getting glass grit in their mouths so I shitcanned all the twist offs. I suppose if you are really careful and inspect them all really well it would be OK. Just don't like taking the chance myself...