[Pete]

Originally Posted by Tony, NY

Lap- to polish until smooth.
Put an abrasive compound (valve grinding) on the axle taper and put the hub on and spin it (no key of course) by hand. Take it off and wipe clean to check the surfaces for full contact. Do this number of times required. The compound takes off the high spots until they surfaces match. When the surfaces match you will have the best taper fit you can get and no movement to shear key (if torqued properly) . That's my take on it.
I'm sure I'll be corrected, if wrong.

Right on Tony.