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You could just make a metal jacket that is wider and goes over the blade's spine like a frameback....that will akt as a honing jig an solder that into place or epoxy it:)

The EDM is realy cool...

What puzles me is that the spine looks thin-ish...but so do the bevels...how did you hone it?
Usualy there is a ''golden ratio'' for spine width/blade width for the...