Her blog entries HERE describe in great detail with wonderful photos how to make one yourself from parts you can find at Home Depot.
She has given permission for anyone to share the information and spread the word. Her post is below:
A while back, in 2006, I made my own adaptive writing device. A friend suggested I try putting a crochet hook in it instead of a marker, nearly 2 years ago, and I’ve been crocheting with it since then. I figure people in this comm might be interested in it, or know someone who would be…
Design, instructions, and pictures of the assembly are at http://markeronastick.blogspot.com
(Note: I am not selling any of my Device. I am releasing the design and instructions to make it free, under a noncommercial license, to anyone who might need one. Please share the above link with anyone you know who might benefit from an adaptive device of this sort.)