Check pic on my profile this is how i attached my wheels to a ww motor. I used a small block of Nylon 6 with a hole slightly smaller than the hub, then bolted this on. i then drilled a hole through the side of the block and straight into the shaft. These i then taped out to take a bolt to hold them together. The 4 long bolts are to attatch the wheels to. The wheels never came of even after being hit by VORTEX.