I received a new old Auto-advance unit from Victor Horley, which really did the job.

(Just comparing the two advance units)

(I observed that the alignment of the two pins were perfect on the new unit, but not on the old unit)

(Note the gab on the new unit, this limits the advanced position)

(These roller balls are in perfect condition)

(The advance unit dismantled)

When the unit were dismantled, I measured the balls, which were Ø = 14,3 mm and Length = 14,3 mm. (The weight - which is the most important one was not possible to measure, because I do not have a weight that accurate)

The old unit advanced about 40 degrees on the dynamo, but the new unit did about 30 degrees (need 34 - 38 degrees according to book). So I adjusted the auto advance unit slightly, to make it move the 4/2 = 2 degrees more. This was done by removing material from the metal arm bended downwards in the picture below (done in all 5 places) Be carefull not to take too much, and you will not be within the limit described in the Workshop manual. 

I obtained a 4 degrees ATDC, with a 30 degrees BTDC in full advance.

Thanks Vic.

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