Almost two years since I started this! Anyway its getting tantalisingly close now. So thanks for the help and advice.
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One name to add the credits above the usual suspects is Charles Ping for letting me know what a Meyer expansion valve was - didn't know when I started this. To be honest, I haven't made the valve yet, it just runs on a standard simple slide valve. And apologies to the guy who pointed out that the style of lubricator I was making was a "Shapely Lady" - I've lost your name.
Steve