>>9551042 Full functionality in robot mode and it adds ankle rotation. This does require removing the ankle pins but that's actually fairly easy. Use an appropriately thin pin punch or nail, give them a whack or two with a hammer on the back side of the leg, pull out with pliers.
I will admit I hamhanded one foot and accidentally tore the rotation part off one, it's held on by a screw, and that screw is under a pin, so to fix it took a little effort but JB Superweld can work miracles with stripped threading. I don't mind doing stuff like this because I am insane, but I would hate for others without a toy mod/surgery kit and possibly-autistic dedication to be in my position. Be careful with it, don't yank on the foot lol