Turns out the promised Bosch starter was out of stock so they sent an aftermarket item instead. I'm fairly sure it will be junk from past experience so if anyone does have a decent item going - operating or in need of refurb - that would be good.
i have , a refurbished Bosch if you can find one will be £130 or so , I’ll look more in the morning, I have one refurbished and one not I believe
Its short shaft (I think) that I need (for a Type1 rather than Type4 engine). 180mm flywheel. Early type release bearing... I've seen some SMs with 7 teeth and some with 9?