Higher torque capacity with keys than taper locks on plain shafts - they slip quite well trying to transmit high torque.The taper lock mechanism on this one has a keyway built in so it's belt and braces for this particular application.
Could it be the taper lock is the wrong size? mismatch in key size?The taper lock mechanism on this one has a keyway built in so it's belt and braces for this particular application.
Call me old fashioned, but does it not make more sense to inspect the thing & gauge what's needed, before making plans?
Has that shaft been welded before? The weld on the inner end looks very clean, unless it's been rubbing when in use?
Already did.... would avoid brazing