Chagrin:
justone:
...get the 5/8" bore sprocket and get a 7/16" to 5/8" bronze sleeve bearing (6381K465) and with a hacksaw cut away for the key.I would suggest cutting all the way through one side and then grinding a tall key that reaches between the motor shaft and keyslot on the sprocket.
If you try cutting a keyway without an arbor press and keyway broach I think you'll find it nearly impossible. You can't do it with a hacksaw and trying to file it is incredibly painstaking.
The 5/8" bore sprocket would already have a keyway so there is no need for an arbor press or keyway broach. The hacksaw was just to remove the part of the sleeve where the key would be,like turning a "O" cross section into a "C" cross section .