Miniature holder for painting with larger hands

See it in action here: https://quik.gopro.com/v/UaBeLvSyMo/
I've been painting miniatures for over 20 years. Most the time, I use a cork or other item to tack or pin the model to. The problem is, with larger hands and over long periods, it causes cramping in my fingers and joints to hold such a small piece. Plus, I never feel like I have a good grip on the model. I created this to eliminate those problems, and also allow me to rotate the model while painting without losing grip.
Suggestion