The client had trouble controlling the joystick of his wheelchair because of a severe tremor in his forearm.
He was supplied with a wristband containing a flat rare earth magnet, and a small steel plate was attached to the arm of is wheelchair. The effect was to hold his wrist against the arm with sufficient force to suppress the tremor, although he was able easily to remove his hand when required.
Bournemouth & District panel ref. 67/69