Another gamma Stirling. Both strokes are 15 mm, work piston is 12 mm dia graphite, displacer is 17.5 mm dia and the glass cylinder is 18.5 mm inside.
Another picture
This is what she drinks, no meths, straight stuff...
And here she runs
The flywheels have some balancing, but not enough, she walks around the table somewhat.
The burner tube is too long, the wick stands too high. Have to cut a bit off it, and fix it to a proper board. No polishing yet, just finished it yesterday so it would run. Always nice when a new machine behaves