no, not me Bill. On the Shadow it still runs a standard drive, it is the ATD drive pinion that has been modified, No magneto and EI does not require mechanical advance / retard as handled by EI map/circuit board.
The EI is driven by a straight forward pinion, I've not pulled the EI trigger unit so can't comment on drive shaft / taper etc but am intrigued to know how it is supported. The EI trigger unit must have a support bearing and I wonder if the RH case was machined to accept a bearing. Although I find it hard to believe that the case would have been so radically re machined, perhaps there are two bearings contained within the trigger unit?.
Considering the above, what I have picked up anecdotally is the motor was used in a grass track machine, was seen on a bench in a totally beat condition, also the motor has been chopped either when it was grass tracked or rebuilt and I guess when a motor is that knackered boring out a case to take a support bearing for the ignition drive is not that radical a consideration.