adjusting auto rrpms
Thread drift, but yes, you can adjust your autorotation rrpms.
I'm sure all of us pilots have heard the term "flats" from the engineer when doing track and balance flights.
in track and balance you can adjust blade weight, trim tabs and angle of attack.
you set autorotation rrpm by adjusting "flat pitch" angle of attack by means of push rod length, acheived by turning all push rods a set amount of nut "flats" to correct for over/under rrpm on an autorotation. (for Bell anyways, not sure on others)
This autorotation rrpm check should be done after the completion of every track and balance.