Capt: A) Will the bolt-on part have the LH threads?; B) Will you retain the key and keyway? ; C) Will the the final product have the bolt heads on the back of the flywheel center? Just having trouble visualizing rotational alignment of 'drilled nut' and fixed relative position of the threaded holes in the 'back plate / flywheel center' Looking forward to explanation of just how to accomplish this procedure. Good Luck.

Do you have verical clearance on your drill press to drill the holes with the hub tight on the crank?

I question the ability to easily repeat proper alignment and tightness of the 'nut' portion. Some of you machinist, please clarify.