I'm making a drive shaft connector for my chain drive and I couldn't find the right tools to make a keyway in it. So, I drilled holes for the set screws and just used those at 90 degrees to hold the clutch in place on the drive shaft. It seemed to work ok with no serious load on it. What do you guys think? Am I ok with the two set screws or do I need to find the tools to carve the keyway?