Thread: DMT question: how worn is worn out?

So let me preface this by saying that I have had this DMT 220 (xc) for a few years now . It has flattened my norton 4/8, King 1200 and more recently some Jnats, including a Hideriyama suita that grabbed it and just about didn't let go. It still works for lapping my King etc but it has mellowed dramatically. So I looked close under the $10 scope and here's what I see:







Compared to the non-worked areas:





Overall:


How long do you guys keep using yours before giving up and getting a new one?

I haven't trie the silicon carbide powder yet... don't want to mess any more than needed.