[Hawiian Cadder]

augers would work, two augers with oposite direction helixes, the spin the opposite direction of each other to go forward or backward, altering the speed that each one drives would achieve holonomicacy. to go sideways, both spin in the same direction, due to the way the screws are set up it will not be vulnerable to pushing from one side while traveling at 90 degrees like mechanum is to some degree, i think ill ask on Q&A next year if that would be legal.