OK.. The news is good!
I removed a rear wheel and the disc to have a look. The handbrake function is as you know a drum with drum style shoes inside the disc.
Turns out the handbrake shoe is almost a circle and is in fact the spring. The actuators simply widen the diameter of the shoe.
The adjuster on the mechanical actuator was way too lose.
If anyone wants photos - I can oblige - but because its not a Morgan bit of kit, I wont bother putting them up unsolicited.
