I confess I have been playing with these things for to long to contemplate. But I still find Richardson's instructions hard to follow,I honestly could not tell you after adjustment if that lever will work in all gears or not. Sometimes it does and I have even been able to smack smack smack as per the book up and down, and some times nothing is right, and worst of all is a perceived perfect action on the bench and then one gear is not always trustworthy on the road. Its not that I dont understand the mechanism and I know if a part is worn, Its just I find the difference between a good gearchange and a poor one can be an almost imperceptible adjustment. Having also worked on the Albion box I think I can see where the ideas came from.
If anyone has an understandable foolproof method with or without Gismos now is you chance to tell us.
Alternatively I rather fancy trying the modifications developed by Thomo (He of the Four valve Vincent).