I'm considering building the regulator described by J.M. Huckabee in "How to Build a Regulator Clock", published in 1988. I'm puzzled by his use of aluminum plates (the pivots run in press-fit bronze bushings). Is there any advantage of aluminum over brass plates, other than cost? Aluminum has a higher thermal expansion coefficient than brass, so thermal stability is not the answer. If anyone has built a regulator clock from these plans, I would be happy to hear about your experiences.