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There is a 1" dia. bore in the cylinder casting, and the brass disc forming the governor valve is also shown as 1" dia. Is the disc supposed to be an easy fit in the bore, say, 31/32" dia, or is it supposed to fit against the end face of the 1" bore, say, 1 1/16" dia?Is it recommended to drill a couple of bleed holes in the disc to prevent the engine from coming to a complete halt when the valve closes?