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One of my favorite projects. An external combustion engine or Stirling engine. The project that you see in the video I made from jars of kvass. It was quite difficult. It is necessary to make sure that the working fluid (air ) is in a closed circuit. It was the most difficult, I had to suffer a little. Aluminum spokes will also be required to connect the displacer and the regenerator. Note that there should be a 90 degree phase shift between them. The length of the regenerator arm depends on the temperature difference between the displacer and the regenerator. Since I used ice and cold water, I need to make sure that the length of the regenerator arm should be equal to half the stroke of the regenerator piston. The length of the displacer arm is also determined experimentally.  This is exactly what you need to do at the beginning. First, determine the length of the displacer's free stroke and remove the shoulder by half the length of its stroke. After that, proceed to the regenerator. Then your Sterling will start working. Sincerely, Yuri Kovalenok