@teapot
I did say back in post no. 4 that the user might eye-ball the center of rotation, but then I am just a rough old engineer.
Since you are good at coding I was going to suggest a script for center-line guides on the desired layer. However, I can re-cycle the old (ancient) Gregs Crosshairs script and it seems to work. Add center-lines to the layer before selecting the set.
Looks like this: https://i.imgur.com/pk6ctVB.mp4
I did say back in post no. 4 that the user might eye-ball the center of rotation, but then I am just a rough old engineer.
Since you are good at coding I was going to suggest a script for center-line guides on the desired layer. However, I can re-cycle the old (ancient) Gregs Crosshairs script and it seems to work. Add center-lines to the layer before selecting the set.
Looks like this: https://i.imgur.com/pk6ctVB.mp4