Ron---That was my thought. I like to build the small steam engines, but it is difficult to come up with things to power with them. Everybody likes the slinky machine. My thoughts with a pump like this is that it would probably work best with a light, odour free oil. That way you wouldn't have to worry about rust in the pump, it would be self lubricating, and a light oil wouldn't evaporate away when not in use. (Not real sure about that last one). I'm kind of burned out on building things right now, but this pump idea has been going around in my head since last week when somebody posted a drawing of an injector pump to fill a model steam engines boiler.---Brian