bearfoil:
If you are talking about the THS jamming or breaking in the nose-up lock position, think carefully before going round the houses again - look at this (again please excuse the low resolution, I only have the PDF to work with):
Yellow : Elevator movement commanded
Green : THS begins following movement (autotrim)
Unfortunately the inputs are never held long or forcefully enough for the THS to make significant movements (remember it took over a minute of nose-up to go from cruise settings to full-aft), and the nose-down elevators last for 10-15 seconds at most - crucially they are immediately followed by a return to nose-up.