Looking to replace the rear door lock on the right barn door on a panel. The lock shaft has broken off. Anyone have any tips on installing the lock? There's not a lot of space in the door and it would seem the handle latch needs to go in first, but then there is no room to access the retaining clip that holds the lock to the door. Any information greatly appreciated. (I posted this on A-D Truckers, (and in Antiquated) but it seems very quiet over there.)