I was wondering if there is a step by step on how to AI an older non-AI lens on the net. I tried google and here in a search, but found nothing. I've seen lots of nice non-ai lenses for very cheap I would like to get, but need to know where to grind the metal off the lens. I guess I could buy an already Ai'd lens and go from there. But was wondering if anyone knew of a step by step.