I just finished another wizard and added it to MY TURN wizard, it is for cutting an internal groove, like an internal o-ring or snap ring.
Unzip and put in Mach3\turnaddons\MY TURN
Put the bitmaps in Mach3\turnaddons\MY TURN \bitmaps
The wizard also has
Left taper to Face
Right taper to Face
Parabola
End Groove