Hi Greg, keyway is also my issue, that is why I would have to build a steel casing around the outside to hold it all together. These are probably the toughest of the small rideons and you are probably right, if the clamp bolt was loose the keyway was taking most of the load. At least you can remove the hub from the shaft, the earlier ones had no hub, the wheel was straight on the shaft and some of those wheels are impossible to remove. On one I had to end up cutting the axle out of the chassis and get it into my press to get the wheel off.
