Add curved surface

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…

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…

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