[Veselin Kolev]

I had a situation like this two years ago. Lets just say, the calculations all worked out to about a 1.7 safety margin, with a 12 tooth 20 pitch hardened 3/8" face gear. Yet, somehow, the teeth still magically disappeared. Later, we found out that the gears were running misaligned. If properly machined and screwed down, your drivetrain should be fine. However, if I were you I would still make a few spares...