Thinking about over-torques etc....
I remember talking to a PNG driver about 1995 (ish) when a MIL 8 lost a couple of blades heli-logging on the West coast of NZ. He is a trusted friend and stated that the particular machine had been excessively 'G' loaded by another pilot, while in PNG. It seemed well known that the guy was extra hard on the machines. Subsequently 2 very long time professional pilots lost their lives and a heap of kids lost their fathers. I wonder if an attitude change in that previous firm may have prevented those deaths.
Around here a pilot recently had a MGB 'partially collapse'(only way to decsribe it...) on a piston. It typical for these old machines to be pulled until it runs out of throttle or RPM starts to bleed off. Forget the guages and just make it fly. Employers will show you that the aircraft can sucessfully exceed the limits on a checkride. Nothing like leading from the top with good airmanship.
I personally avoid it like hell and prefer to attempt a lift to the max limit and then step back and reacess. If I have to pull the arse out of any machine then I am more or less saying 'Well Mr Bell, Sikorsky, Robinson, Hughes etc...suck on that - you were wrong! I know something that you and your legions of engineers/testpilots don't.' Everyone knows that pistons and turbines can cop a hammering and continue unfazed. Its easy to forget the blades and tranny as the above examples show.