Jeff,
Nice work. I like seeing a nice piece of machining. I have not built any engines from scratch but just modifiying all types for model aircraft. Mostly gas powered now.
Have you tried the K&S rack for your 1/8" tubing? It is a normal piece of brass for model aircraft fuel tanks. If they do not have it you can do a search for K&S on the web. They have a package that they also sell that is cutoffs and I have had one for quite a few years. All different sizes and wall thickness. Good value for a hobbiest.
John |