The plan was to give the starter an overhaul anyway come winter, but it seems like I have to reschedule!
I guess you can't see the starter from the access panel in the boot? If I have to remove the larger engine cover I have to get the car to my garage first and take it from there. I really hope I don't have to change the ring gear…
I'll try to check the terminal tonight, meanwhile: more ideas are always welcome!
/edit
Oh, when checking for spares - same starter for every F/TF or what do I need to look for? 12 teeth all over?