Leveled main gear upside down on steel saw horse and used one of the control rods to support the plumb-bob. Pulled a string line tight on bottom dead center of axle bores and measured from both axle bores to establish center of string marking string with .031 stainless safety wire. Aligned plumb-bob with mark on string to establish center of main gear. Marked same with scribe line.
Precision level used to level horizontal plane of main gear
Gear clamped to saw horse
Plumb-bob supported by stiff rod and lined up with centerline mark on string line pulled tight
