Originally Posted by Hemidoc
Standard that came with my brew kit. Works great with glass bottles, not so much with the aluminum.
If you had been using a bench capper, I was going to suggest a wing-type, as those tend to exert less downward force. But since you're probably using a winger (that's what came with your kit, right?), I can't think of one that would have a lighter touch and still make a good crimp.
Those aluminum bottles are probably going to crush, no matter what you try.