Today some hollow bar was collected for the boiler extension, and it was machined to size.
Also on the way I collected a 1/4" ball valve for the regulator. The ID through the ball is 7.5mm which is the same as the 3/8" version, the larger valve simply has bigger threads! This one will have some cranks and levers to drive the valve as there's more height to fit the whole assembly in the dome. The regulator rod will fit into a socket on the back of the elbow...similar to fullsize practise.
Happy steaming!
Nigel
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