Thankyou for posting this detail on the mechanical side of magneto restoration.
In my early attempts at classic racing I ruined two sets of pistons before I realised the asymmetry of my ignition timing due to poor alignment of the armature.
While checking to this level of detail may seem over the top for everyday use it is exactly this sort of accuracy that makes the fastest bikes go fast!! (and reliable!!)
If you get every setting - ignition, cams and valve timing, carbs exactly right with a blue printed motor you will gain at least 5 bhp on a 500 cc bike. 8 bhp on a 750.