All I know is that as a mechanic in the 1970's when one needing help came into the shop, none of the other staff was willing to attempt fixing it so I was given a chance -- two days later I was still stumped, I think the only bike I ever could not fix. YMMV!
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Larry:1958 Drysdale, 1961 Gitane Gran Sport, 1974 Zeus track, 1988 Masi Gran Corsa, 1974 Falcon, 1980 Palo Alto, 198? Vitus 979. Susan: 1976 Windsor Profesional.