Grunff wrote:
Anyone know where I can get a Schrader valve with threaded stem +
mounting flange? The little bike shop which used to sell them has sadly
closed down, and I can't seem to locate a source.

For future reference, I got some from these guys:

http://www.mandp.co.uk/productInfo.aspx?catRef=506344#


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Grunff
Low temperature Stirling engine:
http://www.shinyshack.com/product.php?prid=211027