we use a broach to cut the ketway in our wheel and pulley hubs, and either mill our own keyways in shaft material, or buy keyed shafting. We NEVER depend on set screws, but retain the keyway/wheel assembly using larger bushings outside the heel hub between the axle block or frame. if you do use set screws, it is advisable to double set them (one on top of the other) to lock them in place. Just another opinion for you to consider.
