Not sure how I got here, but here is a GitHub Wiki article about a DIY trackball kit that YOU HAVE TO RUB WITH TOOTHPASTE HOW AWESOME IS THAT

https://github.com/ploopyco/nano-trackball/wiki/Ploopy-Nano-Trackball-Kit-Assembly#step-18-optional-rub-the-ball-with-toothpaste

😂