Well, I stripped motor housing and now understand how the emergency release works but this is not the problem. If you can imagine that the cable is a bolt and the motor is the nut, when operated the nut turns pulling the bolt (cable). Instead of the nut being held in one position, it move down the bolt.If I jam the 'nut' the handbrake works. I think I will need to bite the bullet and get a new motor.Hope the above makes sense
Cheers Les