Didn't take a picture did I, but the nut in question sits in the recess and there's an Allen key recess in the shock absorber shaft to tighten/loosen against.
I also used an Impact Wrench to remove the top nut but it was the last resort.
Tried all hand tools to no avail and pretty much rounded the hex in the process. In the end I got so fed up I just buzzed it off with the Impact Wrench.
BMW should have put flats on the end of the shaft rather than the PITA hex.
Did the rear shocks last evening and the 17mm socket wouldn't fit in the recess, then tried a spark plug socket with 16mm opening and oddly it's the right size...
So at least on my car they're 16mm nuts, didn't look too badly rounded and the socket fitted well so I don't think they're 17mm that have been rounded with an impact wrench in the past.
Anyhow, this is what is used to tighten:
Spark plug socket with ratchet spanner for the nut, long Allen key, with socket and screwdriver attachment for sufficient leverage for the strut.
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