[MrForbes]

We ordered a hub like that, and I expect that what we will do is to drill and tap it for a set screw (probably 10-32), and file a flat on the motor shaft. The screw would probably be opposite the key, possibly 90 degrees away from it...??? although it probably doesn't matter. I've seen some industrial pulleys with a set screw on the keyway, too.

We are probably going to use a chain drive so we can play with the speed of the shooter wheel. This lets us mount the wheel on a bolt, instead of having it supported by the motor itself. My guess is the motor bushings won't like having to support a large spinning wheel for a long time.