I just wanted to share my experience of using an Electric Hand Massager.
One of my most annoying symptoms is the rigidity of my hands and their tendency to turn into claws (I'm struggling to straighten up my fingers in particular in the left hand). Like many PWPs, I also suffer from dystonia which makes it difficult for me to write, type, use cutlery et cetera.
I practice hand and writing exercises every day and my wife very kindly helps me in massaging my hands, all of which I think helps retain the brain connection.
I was looking for an additional solution to this and have bought this hand messenger that I find quite useful. It not only massages your hands but also can vibrate and heat them up. amazon.co.uk/dp/B08DRTTTVW/...
There is no silver bullet or miracle cure but I wanted to share this experience with the community in case it is useful to others. I would also welcome any suggestions from others as to how to train the hands.