As Alan said.. 360/venom drive well due to 4wd skid steer...

Diablo has wheels at the front and a ball transfer at the back and it's totally un driveable...

If your making this robot to go against spinners... Cover the wheels... And angle the edges of the wedge down to the floor... As it is, it wouldn't take much horizontal force to rip that arm off... Remember the force being pushed sideways onto the tip of your arm will be even greater at the pivot point due to leverage.