This is HSS steel and about 64- 65 Rockwell.All work are done on hardened steel .Hole are drilled with drill bits for ceramic tile and that ellipse was done in same manner .First I drill two hole , then cutting disk on Dremel to join that holes and after that small grinding stone on Dremel ..............Hubert: Thanks…Skeletonizing the tang more would be ideal. Not certain how to accomplish that without heating the knife through drilling/grinding, it’s Rc 62. Ideas?

If it is mine and I want to remove some weight , this is what i would done .........without compromising strength of tang .

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