In Reply to: Parts catalog errors.... posted by Farmer Dan on February 10, 2019 at 08:58:46:
Yes, my May, 1950 MPC has two page 131's -the original and the newer insert. The index in the front has the Chapter TACHOMETER stamped over in red ink with 'PROOFMETER'. The TACHOMETER page lists p/n 8N-17366, shaft, twice. Yours, too? This is the best 8N MPC as it contains all the changes that were being made beginning in early 1949. By April, 1950, at or around s/n 263844, the side mount was introduced, the proofmeter, the new 20A generator, new governor, and lotsa other stuff.