Basically, where the lever blade keeps the TPA bolt still, it's made out of cheap/crap metal. So instead of keeping the bolt firmly in place so the TPA bit spins instead of the bolt, it just grinds itself apart, so the bolt will just spin, making the TPA useless. Plus water bleeds just disappear from them, and the original oil bleed my one had as new felt pretty crappy after a month or so.. Can't wait to get my Vee.