Jack, I believe the British Beer Kegs lack sufficient temperature stability and 
dynamic range because Budweiser is best at around 34 to 36 deg F, and I 
understand Guinness never gets much below room temperature, hence the lack of 
dynamic range may pose an impediment.  Maybe an oxygen cylinder used in welding 
might have a better l/c (length / circumference) ratio?  73, Steve NU5D

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