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Oversize headlight rim screw in stainless steel 3.5 x 22mm, special 1st oversized screw with locating peg to make finding the thread in the headset easier.
If you strip your threads tightening up the rim, then tap to 3.5mm and this screw fits and repairs the headset.
made by MB
FITS:
Series 3 Sx, Tv, Specials & Gp/Dl