About 20 or more years I had an inspiration to build a model water well pump, and I went so far as to pour two castings. One in aluminum and one in bronze. Then I became distracted by other things and like myself the castings have been aging. So long in fact that the bronze developed a patina. A couple weeks ago I decided I better finish the job before I loose the opportunity.
Both pumps work well as can be seen in the video below.