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the bearing is not the issue using an impact gun - what actually happens is the shock wave caused by the rattle gun can and does move the position of the tapers in the flywheels - it screws up the wheels true -- the 3 with key ways are not affected ( as much ) as the crank pin one side that does not have a key way
then we come to the AMF idea the sprocket shaft did not need a locking key way - well 1000s of guys will tell you that was not a good idea -- because they experienced the shaft spun in the flywheels - did it come from the rattle gun of popping the clutch both do the same thing
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