What are the wear limits on the uplock block?  Photo is of "C" model with 4000 hours, apparently the original uplock block.  Taken in flight, the view is from below and shows how the steel top of the Johnson bar has worn a groove in the aluminum block's ramp.   The hole is worn oval, and the end of the locking pin appears worn to a bevel, too.  It feels secure when I latch it, and give a big "heave ho" test on the handle as part of the GUMP check.  Questions for the forum: (1) Is there a