I wanted to see how true my bed was to my router. I dug around and found a scrap piece of oak and some screws. Drilled a few holes and here ya’ go…
Works great. I place in the corner I believe to be the highest, run z down some so that the pin compresses, set my dial marker to 0, then I slide it around to the other corners watching how much the dial changes. With 2 screws attaching it to the motor mount it is quick and easy to attach and remove.