My modified design for the dial gauge mount:
And the final print, which is considerably better than the previous one, thanks to my discovery that the X axis belt had become very slack.
Looks much better. Only whilst the design has an internal diameter of 53mm for the body of the dial gauge which is 52.85mm, the actual internal diameter has come out at 52.55mm so it won’t fit 🙁 I was so sure I was on to a winner there, too.
Back to FreeCAD once again…