I'm sorry for that.
I've designed the boiler tube pilot to the best of my knowledge and belief.
I've enclosed two meaningful pics and a drawing with the main dimensions to my advertisement.
What else should I do?
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Pilot for the Kozo Hiraoka Rio Grande K-27. Gauge: 89 mm (3-1/2"), scale: 1/10.27 (1' = 1.17").
The dimensions and the design base on Kozo's drawing (Live Steam Magazine Vol. 51, No. 2).(Edited)