moxfyre

I've done it with an old wood handled screwdriver and a hammer (to remove the lockring). I just stick the flat blad of the screwdriver in one of the notches and tap it lightly until it's loose enough to do by hand. The reverse can be used to retighten the lockring. Don't hit too hard or you'll probably take a chunk of paint off the BB shell.

It worked fine for me but was kind of annoying and slow.