I second that comment. I had 5 threads showing when I started, and I re-set to show the same 5 threads. I'm bound and determined to come up with a way to easily access and adjust the play with the box back on the car though, maybe look at cutting an access hatch/door through the firewall. I couldn't even see that screw/locknut from above or below, let alone get an allen bit in there and 19mm wrench on the nut. The manual shows a ridiculous 90 degree bent closed end wrench, kind of hooked to the nut from below.....maybe time to invest in some crowsfoot wrenches.
I read your comments on adjusting the steering worm play with great interest, and thanks for the heads up on rebuilds. (Reminds me of a shady transmission shop I know of, the owner carried small shavings of metal in his pocket to sprinkle in the pan to show the gullible customer he needed a rebuild). I set mine as best I could, but no way to really know if it's right without the right Ncm measuring tool. The box is still on the bench - any tricks to verifying that the preload is within reason?

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1986 560SL
2002 Toyota Camry
1993 Lexus