G9928 Dial Speed Control Adapter

This will allow you to switch out the pedal on the speed controller of the G9928 flex shaft grinder for a speed dial. This is another thing that came out of me working toward my own CNC machine design, since I'd like fine grain control of the spindle speed but don't want to build a separate controller and obviously don't want to operate the pedal by hand (foot?).

The G9928 grinder (and similar grinders that appear to be from the same manufacturer) is reasonably priced and is more powerful, m