I have a shoe for my CNC mill but would like to add a round to the narrow end

The shoe is clipped on to a CNC mill. The hole shown is where a drill passes through. The other end is connected to a vacuum hose.

To reduce the volume of the shoe and improve the suction I would like to add a round to the lower narrow end that will extend into the flat surface about half way along. Any ideas of how I can achieve this please?

CNC Boot.PNG

Answers