[mrlg220]

We also had this issue a few weeks ago. We actually didn't use either of the key hubs; rather, we bought the andymark 250 hub (.25 inch hole). We drilled the hole open just so it fit onto the shaft (.313" or so?). We then added a set screw on the side. Hammered it on and it works perfectly. Note that for the kop wheels you'll be fine, but the plaction wheels need special fasteners (to attach to the hub).