Well the kinda come pre-worn now a days...so it is pretty hard to tell by looking and the teeth...I honestly don't know when I replaced my cassette last. I got off the bike for a few years & all I know is the chain only had about 200 miles on it. Will the teeth take on a certain wear look or shape?
Sure thing.max.min, I'm intrigued by your method. Could you give a little more info and maybe a picture or two?