We adjusted low Pitch stop to maximum but no RPM rise. The linkage itself is quite simple to a adjust, but that is not the problem. I will measure the low pitch angle to check for a wear of the propeller. Last overhaul was 2009 and last maintenance was 2020, lubricaction of the hub.
A month before my Mitchell tach showed a malfunction, an overspeed on take off of 2900 rpm without a change in pitch tone. The new tach showed only 2600 and then 2550 on takeoff.
I will keep you posted…
Thomas