ZOMG I can hardly believe it. I had noticed that Kevin recommends putting in a delay value to improve torque, but I thought "Jeez, this thing is slow enough already" and "It moves the knob just fine, no need to putz with that".

Well, imagine my surprise when I put in a value for that and the pulley started whirling around at speeds never before seen!

If there's backlash, it's less than a step, which means less than 0.03mm focus-tube linear movement by my measurements.

Think I probably got it now. Sigh. Thanks again for all the help. I'll let you know the next time I can see stars how it actually goes.

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