Welcome to the Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines - Enjoy!
Great runner on air, hope to see it on steam soon Thanks again Charlie for the generous gift! By the way, you've got the overflow plug where the safety valve goes edit: oops, just seen you have them the right way in the picture
And the steamcos don't like to run with the SV in place on this setup, they are all the same hence the OFP in the SV hole.
When we were test running it before the vid, the safety valve kept on releasing pressure before there was enough built up for the cylinder to run. Only way to get it to run was to swap them out for that vid. Otherwise it wouldnt run