

Create a semi circular extrusion
Building a plug, and this slot in the knob is a semi circle (think a coin fits in there to help turn it). How would I go about extruding that as a circle? I'm not sure the second photo of the real plug you can see, but a coin would fit in there. I know I probably don't need the circular shape, but I'd like to learn how to do it. Any help would be appreciated.