You can buy these, but I decided to do it myself. Here is a video of the build: https://youtu.be/yPNjlqHtmzoFull drawings are available: http://ift.tt/2lflIiL the blog post: http://ift.tt/2jTF94t are used on height gauges, which are typically found in the metal shop, although many woodworkers use them as well for setting table saws etc. via /r/DIY http://ift.tt/2kdw6Hl
