Hello
Just fixed mine.
The strap is broken and the pressure switch does not seems to do its job.
1) On the main shaft, there is a screw, to adjust the face plate position at rest.
I simple readjust the face plate to the " on " position ( spring is compress) and thigh the screw. No need to put any block, as mention in one of the thread.
2) I unplug the motor connector and I short circuit pin 2 and 5. No need to remove a diode, as mention in one of the thread.
Hope that helps, 3 years later ...
Still sad to have lost that useless but fun feature.