Tell us details about your custom rotary control

Oops, sorry, missed this one previously.

It's made of alumin(i)um stock, turned to a slight taper (sligthly wider at the base), slightly concave top. I made it as a proof of concept before talking to a friend about making one in stainless (my small lathe doesn't much like stainless...) The final one will have grabby nothes milled or ground into the circumference/edge of front surface - with this one I almost always have to grip it to turn it.

The one thing I don't like is the hole for the grub screw... Unsightly it is...
Anyone with any good ideas about other ways of securing the knob to the D-shaped axle? On this one there's a 6mm hole for the axle from the rear and a 2.5mm hole threaded to M3 from the side. When installing I make sure the grub screw goes against the flat of the 'D'.

/Michael

/Michael