I just received my new RD8-II rotator and is looks excellent -- much larger than I expected. I have a few questions:
(1) The locking knob has an additional, smaller know screwed into it; what is the purpose of this second, smaller knob?
(2) There are stops for 30, 6, 5, and 4 degrees, as well as second set of stops for 30/2, 6/2, 5/2, and 4/2. If I want to set my stops to, say, 20 degrees... Should I just tighten the 5-degree stop and click it over multiple times on each rotation, or is there a way to set it so that it only locks on the 20 degree marks? (I guess I should try tightening knobs on both 5 and 4...?)
(3) There is a very small knob that seems to allow you to rotate the indicators without actually rotating ("clicking") the unit. Is that the purpose of this small knob?

Silly questions, I know -- but there is no manual, so I am just confirming how the product works. Thanks!