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I have had excellent results with the edge retention on my knives. It is one of the most compliments I get from my customers. I use a convex grind on the edge and that along with a good heat treatment gives me the retention and have never had a problem with deflection. I contribute that to paying attention to the heat treatment process and the convex grind helps.
On one of the first tactical knives that went to a SWAT officer, he had to use the knife to cut though a double sheetrock wall to gain entry into another room on a tactical operation. He advised that the finish on the knife now has many scratches, but the knife cut though the walls like it was butter.
I also think the use of a good quenching oil helps in the heat treating process and I have had excellent results with the Brownell's Tough Quench oil resulting in consistant hardness on the 0-1 knives.
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