I found the following December 7 BBC story, The invention that helped me write again, from a posting on a Facebook page for Young Onset PD (YOPD). The article, which includes a cool 3 minute video, shows how a special vibrating wrist-band can greatly reduce the hand tremors of Emma, a young woman with YOPD, to the point where she can do graphic design again. The effects of this device are pretty spectacular. Apparently it was inspired by spoons that can reduce tremors through a feedback vibration. I have not been able to find out any information on availability as a commercial device though.