I had to unbolt the lock from under the seat to get it open, then discovered the cap on the end of the tumblers had broken. Anyone have that little cap with a small pin that turns and pushes the locking mechanism aside? Or know where to source one? The tumbler mechanism is held in place with a cir-clip. It's am aftermarket assembly... I guess should have bought OEM. I hate to buy a whole new assembly when the unit was relatively new, albeit cheap.