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http://www.youtube.com/watch?v=m2AyB1kPypIHi, thanks, video shows manual operation using a 10 pound weight as a flywheel. I have to remove a few knocks and run the steam lines to each cylinder. I am using 3/8 brass rod for the spool valves. I am not sure how long the valve should be open? There seem to be a short dwell period at the end of each stroke. Looking for a source for a large flywheel or possibly how to fabricate one. Not much to look at and I am making a lot mistakes but the design seems to be very forgiving and the mistakes are easy to correct.