Lessons (not always) handed down
Quote from Chuck Ellsworth:
The most simple cure if you are having difficulty holding the button in the out position is turn off the master switch which stops the feathering motor.
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Do you have also to trip the genny on the other engine? Can't remember whether we tried that.
Quote from Marker Inbound:
The feather check isn't that complicated, push the button, the RPM goes down, look at the load meters, pull the button back, the RPM comes back up, look at the load meters. You do want to give the button a twist before you start because I have seen the little button come off the threaded rod behind it when it was pulled back out.
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Your second sentence sounds like the sort of advice that, in aviation, MUST be handed down the generations of crews on any type of aircraft, lest the experience of the early experts is lost until the next accident... Remember the Viscount flap failures?
Re your first sentence, it was the exercising of the CSUs that I was thinking of, and the mag-drop tests at medium power. Meanwhile, the turboprops and jets were all sailing by... unless we were stuck in their way!