Fettled, filed and stoned my vice, did not skim the base (it was late and I was tired) because it swivels.

Tried my Z axis bearing blocks again, lots more G-code, swarf and finally ….. square, plus a much better finish.

Now for some more complex code, as I want angles on the outside and three different bore diameters.

“Apparatus est amo a infantia, totus Ego operor est nutritor is quod tarsus is”