Bah.
Stripping down the other carb tonight (French ski resorts all closed so no going away for me), and I got to the point of getting this wee jet out of the top, had the screwdriver set in there nice and square, taking care and all, and as soon as I turn it CRACK
I'm guessing I'll need to get this to a specialist of some kind for extraction, or will any old engineering shop do? Also can anyone tell me the name of that jet...