One of my Christmas presents was a kit to build a ball turner for my SB 9A lathe. That went well and I practiced making ball things. I ended up with a nice pair of brass fly balls. They didn't have a home and I decided to convert one of my motors with a flywheel governor to fly ball...
Here is my most recent engine build. It is Elmer Verburg's Scotty engine. Plans are attached as 08_scotty.pdf
Running on about 5psi.
Neat engine, but a finicky build.
Cheers.
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