This is a frame I built to handle one of my race clocks. Nothing earth shattering really, but I did copy a leveling foot idea based upon what is used for a larger scaffold set. I created some threaded feet as shown in the pictures. Then used a maker clamp with a small pipe section in it as the leveling receiver. Then used washers and nuts to level the setup when I got to the race site. I knew the finish line area was cambered and would need to be able to adjust the height.