If I remember, Fokkers produced an AFM amendment to operate with the HP cocks at lock out at all times, they felt that there was no need for the cruise stop. However the CAA had the view that the aircraft had not been certified to operate with the cruise lock disengaged, and UK operators continued to use the system as designed.
I think it was 32 degrees, with the hub switches operating at 34 degrees, I have it noted somewhere.
Herod, I was involved on two separate occasions to carry out double engine changes on Heralds in cases where the flight fine lever went forward on taxi, the aircraft stopped on the runway with the props hanging on the locks, when opened up for take off both engines burnt out, in one case severely damaging the jet pipe.