Verbal descriptions of an old piece of gas & oil equipment are hard to visualize and come to a conclusion as to whether or not you are correct in your assumptions. If you could somehow produce a photo of the apparatus, that would solve a lot of the guesswork. You are probably correct if the pumping mechanism matches the drawing in Jacks book, but a photo would help the rest of us to form an opinion.
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Everything Cities Service
Specializing in old Gas Pumps
kwfrith@gondtc.com
Cell#-701-739-6133