Thanks to all for your comments and compliments. I agree that it since it does turn over so smoothly, and is so small, that absolutely it should run on low pressures, but like everyone else I just don't know exactly how it is supposed to work. Trying to take it apart is not anything that I would care to take on, but perhaps fiddling some with the various controls while having it hooked up to a steady pressure source would help. Honestly, I never really tried to do much with it at all, it has just been a nice display piece, and this motivates me to explore it further, as I always have intended.