I just finished a test where I altered the geometry of a die nut to get bet ter results cutting threads in soft material. It went really well, and I would like to modify more dies for different sizes, but my 3/8" Drill Monster carbide ballnose endmill barely made it through one die. I would like to g et more than one part per cutter, so I am hoping the collective wisdom of t he group can steer me to a specific manufacturer of end mills good at cutti ng HSS. Any recommendations? And thanks for reading.