we had quick nuts on our seat&guide machine. basicly the hole wad drilled at a slight agle to the flat and the threads were square to the flat.just loosen a little and tilt to pull up or down. they work good but dont hold a lot of load.I think acme threads would be a better choice. I like the idea posted but I would add easy to turn flange around the center for ease of spining(tightening/ loosening)