Well it HELPS if you were at one time responsible for generating drawings of that sort, because.. the one they ship is not so much "generic" as "all inclusive". Part of why some of it is so crowded.
It includes WITHIN it more than one rev level, cuts-off when MG production no longer changed, at least on "new" production.
It is up to the end-Luser to take note of the applicable dates for his machine, including - by this late date - keeping an eye out for possible field updates made to the newer revisions. Or for that matter BACKWARDS revisions as non-factory folks - such as our own selves, "Right here on PM" - had made do with such scarce parts as could be found out in the wild.
Pay attention - but most are actually rather minor differences that will nearly always work "OK" be they early, middle, or late evolution.
A Ward-Leonard rig can only get but so complicated before there's nothing much LEFT to alter.
One tiny corner of one tiny IC in a DC Drive, VFD, or ignorant hand-held cordless tool battery health minder can be easily more complex. We just don't see it. And couldn't DO anything about a failure inside of it even if we could see it.
Keeping an MG healthy? Blacksmith and gaslight era stuff.
Kinda like a "survival skill" such as canning and drying food or making yer own shoeleather, feather beds, sorghum, soap and vinegar!
Didn't only "Get" that tee shirt when I "Been There".
Was taught to make it. From a feed sack.
Seams cut with Wiss "pinking" shears could be a right sawtooth nasty underarm bitch, though. DAMHIKT!
So thank God in her infinite mercy we could at LEAST afford "store bought" cotton under SHORTS!