I have a used Supersprox rear 41 with 50,000 miles on it that looks practically new. sounds like it would be clapped-out, pointy and in need of replacement. I pretty much wasted $90 on a new one, but if I had been able to compare before buying, I would have noticed it was almost like new.
This is the old one one top the new one. $40+shipping if you're interested.