In this video I assemble a kit that makes a Stirling Engine. It is manufactured by Kontax in the U.K. and can be found on eBay https://ebay.to/2IujYC5 and on their own website https://www.stirlingengine.co.uk I have no connection with this company and I paid full price for my kit.
There are also a number of cheaper Stirling Engine kits on eBay, although I have no idea about the quality or performance of these. https://ebay.to/2IRDR5C
