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In addition to the above concerns you might want to ask yourself about thru hardening steel, martisite and pearlite and which is left on the edge.

Agreed. Use a high angle to start.
A dmt 325 or 325 silicon carbide sandpaper changed frequently.

Use 1 layer of tape on the spine and change it frequently.
Attach some scales of some kind.
Please do not use the Norton 220 because you will develop carpal tunnel syndrome.
I assume you...