Pack Rat thats relay nice. The PM #5 is a 5/8" bore X 7/8" stroke. It runs very nice on air. I will put up a vid when I have time to figure that out.
I was looking at the Stewart models but was scared off by the British fastener sizes.
I have the PM research dynamo kit also but haven't started it yet. Was thinking of doing a build log on that if anyone is interested.
I don't know how these guys like Mr. Pete and tinker John have the patients to do the Videos, edit and upload. I give them a lot of respect for that. I cant even remember to take pictures of all of the steps. If there is any interest I will try though.