Anti-wobble bed holders for Rapman

These bed holders/corners aim to solve the dreaded XY wobble arising from crooked threaded rods. They also prevent the upper bed from shaking with respect to the lower bed on the 3 sprung M8 bolts. Finally they allow fine bed height adjustment at 4 corners rather than just 3 points.
This is version 15 of my design and the best so far, but it does not remove wobble 100%. I am very receptive to ideas to improve it. To give you an idea of my early designs, here is a youtube video of version ~8: