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I have seen Fred's marvelous "machine" and watched it in operation. What a joy to watch!
I think his aim was to use readily available parts so that the idea could be duplicated by anyone with the minimum of facilities.
If I ever get interested in that sort of photography I would be inclined to use my engineering expertise in live steam railway modelling and my workshop to build something from prototypes made from Meccano (another of my hobbies). Maybe I can find solutions to some of the drawbacks.
Barry
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