Alright, this thread has inspired me guys. I'm going to attempt to grind down my old masahiro gyuto into something more suji/petty shaped. Ill probably use the concrete patio out back to reshape the blade. Any reason I shouldn't use the concrete to do the initial thinning as well? And will it be worth the time to go pick up a cinderblock vs just using the patio or a curb?
Nice work, the new spine looks nicely shaped.