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Gary,
The BW35 went to the scrap heap without my pulling the speedo drive gear, but if, as you concluded, it was interchangeable with the M40's gears, it wouldn't have fit. The M41 pinions have a much longer shaft and larger gear. Knowing the number of teeth could have been of some help. From the data you supplied, I would guess that it was the one with 16. BTW, when I asked my UK supplier if by any chance there was a 22 teeth gear availble, (I was thinking of my M41 equipped PV who's speedo is 10% optimistic.) he replied that no, they weren't because they had only been used in Volvos and the shaft was too long. This reply makes me doubt that the 17 teeth gear he offered me would fit the M41. I asked him the pertinent questions and hope to hear from him tomorrow.
Bob S.
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