From Mr. Patrick Kelly ....
He stumbled onto a deal on a bunch of the Zwickey four blades, and asked me how I sharpened them... belt sander to smooth down the trilam towards the front. I use a flat horizontal belt sander, but Patrick bought A vertical belt sander and I gave him the best advice I could give him.
He did a great job and a finishing edge will be a cinch now that the bevels are smooth as silk
He sent me these......
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