Thanks so much, Greenpants.
We saw that the outer sheave shaft bearing races have bolt holes 30 degrees apart, indicating that the bearing race can be rotated, to raise or lower the ring gear mesh into the worm. The adjustment is very slight, by my way of looking at it. I've seen other manufacturers that (relatively speaking) have a tremendous range of adjustment for the backlash. I guess Otis figures that if more adjustment is needed, beyond the design parameters, then you got other worse problems, that shouldn't be compensated for by an adjustment.
