I wanted a better method of retaining the oil seal and sight glass in the tail rotor gearbox.

   The ends of the housing are slightly tapered. First thing was turning a mandrel to clamp the housing around so the ends of the housing could be trued. It picks up on the outer bearing saddles. The ends were then faced and centers bored larger.

   Then I machined up two retainer plates. One for seal and one for sight glass.

Drilled and tapped four holes.

The sight glass is turned around so the larger diameter sits in the housing against a shoulder and the small diameter fits it the retainer plate. The seal is now pressed into the other plate. I also milled a slot the raised boss of the lower casting for the chip detector/ oil drain flush with the bottom of the housing so particles wouldn't be held back.

Assembled and ready to install.