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1938 301 305 306 307 HERCULES QXC-3 3 3/8 X 4 1/8 Z.C. MODEL 20AVX9 Z.C. ASSEMBLY # 8401-A DT # DX4686 ZENITH TOOLS C161-1 , C161-5 , C161-6 , C161-10 , C161-21 , C161-19 , C161-25 , C161-85 REAMER ( SHAFT SIZE ) C161-71-2 REAMER ( COUNTER BORE ) C161-73-2 BUSHING DRIVER C161-72-2 INFORMATION FROM ZENITH CARBURETOR MANUAL JAN 1946