Well I had some unexpected spare time this morning so this is were I am right now :
This is a 2 grooves version, with a single set screw hole on the side. I seem to remember there are two set screws appart 90° from one another, one being through the indicator groove. I can easily add that.
I'll probably make a single groove, too.
I've kept all the edges / angles sharp, but I'd probably advise putting a little fillet to them, in order to make them a little smoother. If you have some high res pictures I can try to mimic the OG's edges.
I haven't modelled the brass insert
The TXT has to be changed to .STL in order to work