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I am building the clutch-pulley designed by Joe Tochtrop to fit my Economy model engine. Has anybody else out there built one of these? I'm not sure I understand the principle used to make this thing function. Don't believe there is one like this in the real world, at least I haven't seen...

I am building Rudy's steam tractor according to some Popular Mechanics plans I am borrowing from a friend. Frankly, the plans leave a little to be desired which is surprising. There are no assembly drawings, except to general ones of the whole engine (both sides), but NONE regarding small...