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2,442 Posts
Your cutters are going to move on the shaft without a recess to hold them. Also and this is just a personal thing, but I started with traditional tools and got into a habit of running my thumb up the flute to clear chips from the tool. My first carbide tool was one that I made myself. The insert sat just proud of the shaft. First time I used my thumb to wipe it off I got a nice cut on my thumb. A brand new EWT cutter will lay you open like a razor. I now use a set of Rus's tools and his sit flush but I had to break that habit.
