Starter motors seem not to be too high tec for folk with a degree of mechanical aptitude, and I ever looked upon them as servicable items. also basic testing seems none to difficult..? I guess the world has moved on to a stage where fewer folk repair anything...

Actually I just overhauled one for a light 12 Austin, new bushes, brushes, cleaned and commutator skimmed. Got another to do now, as you say easy enough.