I rebuilt my seat/helmet lock. Mine puked the lock cylinder out last fall when the casting cracked. I got hold of a newer one from a guy on another forum and had to completely disassemble it. Of the 4 tumblers this lock uses, I found 1 that was correct for my key so I pulled the other 3 and tossed them. Now I have a lock that works with my key (and probably thousands of other keys as well), but at least I have a seemingly secure place to hang my helmet when I'm going into a store or restaurant.