CASO, I suspect the guys writing the manuals in the vacuum wiper era were likely 4 figure salary types

misfit - need a year to start, vacuum wipers cover a lot of different series - for
the AD series, the initial placement of the wiper arms with relation to the wiper motor [shaft] has to do with finding the correct position for full sweep without banging either side or going backwards .... if you don't have the engine functional and can't do the adjustment, don't worry about it, but remember before you do use them that they might sweep
down across your new paint

Bill