Hey Jim, maybe that are all the scrap parts that he had and used from other projects LOL, I have seen a lot of people that make amazing things from scrap and some of them become the best inventions, look at Henry Ford's 1st engine and here we are looking around for scrap so we can copy it. Us model engineers are a weird lot, we love living in the past and re-inventing or copying the wheel, or are we just nostalgic.