This is an extremely helpful tool, especially for those with limited fine motor control. It is easy to make, easy to adjust and easy to adapt to many different types of writing instruments.
This is video that easily teaches anyone how to take a utensil (or tool of any sort) and make it into something that can be gripped.
Many students who use walkers have limited use of their hands, such as to carry items when walking. This video shows you how to make a tray that attaches to your walker and can be used for things like a cafeteria tray.