I used this tutorial loosesly. The main reason for posting this is the one major change I made. Having arm/wrist issues myself, I made one the general size and shape of a keyboard wrist rest for my carpal tunnel inflicted father. I personally get a lot of relief from heat and often rest my hands on a heat bag while working/typing. If you know someone with hand/wrist issues that benefit from heat or cold try making one for them to use when they are on the computer!