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this set is the second generation "G2" or "Mk.II" edition created by Ets. Verot-Perrin reworking the original in 1981

the outer C/W is mis-mounted in that the small hole is supposed to go under the crank arm, it is threaded and takes a small bolt with spacer/sleeve which is designed to keep the chain from wedging between the arm and chainwheel in derailments to the outside

here is the manufacturer's catalogue page showing the model 99BIS of 1982. the holes are just there for lightening/appearance.



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