More close up work.
Step one, set up. On a desk, with a bottle of gin [subject]. 60mm lens, as close I can be. I remembered I had a slide for panoramas years ago. Not one of those with a screw to turn to move the camera, but nevertheless a rail with a scale.
Step 2, set camera up on that. Focus to minimum distance. In manual. Then adjust by moving the camera along the rail, mm. It works, but its easy to make the whole set up move: add cable release.
At 60mm, at f11, basically there is no depth of field. Hence difficulties. I really have to go to f22 to get anything to work with. But I only worked that out later.
On reflection now, it could not have been a dafter choice: no real edges, and a slightly curved surface. Nevertheless, persisted.
Step 3, add the extender. Only a little one.
Then just for devilment, add lights. At least that gives a spot of freeze motion.
I learned how subtle you have to be in movement, remembered how to adjust my lights, and probably may be about ready to go back to focus stacking on a sensible subject tomorrow.
Still not quite there. Finally, drink the gin. Hendricks is my favourite!