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Does anyone know if casting sets from downriver tools are still availiable?

I have just completed a Breisch duplex pump. pump. It runs and pumps fine on air. However on steam it doesn't run. Steam just goes right through. I have lapped the slide valve in and used vitron o rings backed with teflon for piston rings. How can I tell if it is leaking past the valve or rings...

I recently purchased Ivan Law's book on gear cutting. In making the button tool to form the gear cutter he shows a table that lists the various dimensions for the button tool that forms the different gear cutters. I have a bull gear on a 1/3 scale steam engines that specifies a 16" pitch...