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Horns (key) are adjustable...IIRC...8pt. 1/4", socket 1/4" drive...
I detuned the C to Bb, and tuned up scale the G to Bb...
why?
Because I want to be in key when I yell out the window to every Ricer with a wing, decals, and can-0-bees muffler that wants to race just to see me burn out.