The belt on my XP is finally showing some thread wear. I've got about 600 ( lots of powder days!!!) miles on it. From what I've been reading I think that's some sort of record. So my question is how much longer will it last or is it just a guessing game. Can you still get a lot more miles out of her, or is it once a thread comes out your about done??? I have two spares and am heading to Cooke in Two days..