What was found
WHILE INSTALLING KIT MK172-25-10C TO COMPLY WITH SB 04-25-01 R4 AND AD 2007-05-10, ONE OF THE PARTS IN THE KIT WAS MACHINED IMPROPERLY. THE HEIGHT ADJUSTING NUT HAD THE THRU HOLE FOR THE ULTRALOC WITH MALFORMED THREADS. THE MINOR DIAMETER OF THE THREAD WAS GREATER THAN THE MAJOR DIAMETER OF THE THREADS ON THE ULTRALOC. THE CROSS HOLE FOR MOUNTING WAS INCORRECTLY LOCATED WITH INSUFFICIENT EDGE DISTANCE, AND THE PILOT HOLE WAS OFFSET GIVING AN EGG SHAPED HOLE.