Observer seat tube and crank (NSN 1680-00-195-4398)
General Description
Tube data, steel, mil-t-6736, type 1, condition n, 2.500 in. Lg, 0.371 in. Od, 0.180 in. Diameter through hole located 0.269 in. From firstend, crank data, attached 0.100 in. From second end at 90 degrees angle, 1.500 in. Lg from tube diameter center, 0.063 in. Thk, 0.500 in. W, two holes0.187 in. Diameter located 0.843 in. And 1.250 in. From tube diameter center