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The plans for 'Dickens' call for a wall thickness of .035" (i.e. under 1mm) for the boiler shell. The working pressure is only 10 or 15 psi, so this is plenty strong enough. (I hydro tested my boiler to 60 psi anyway). There was no trouble raising enough steam - in fact I often used only one...

I would be glad to help. It might take a few days to dig out the drawings buried somewhere around here... it's been a long time since I made that first one !

Beautiful ! How is the connection made between the displacer rod and the swinging arm that drives it? ...TinkerJim