• Are they Berthoud, like the stays seems to indicate? Or at least stainless steel? If so, just know that you shouldn't mount them with any stress : if they don't follow the tyre perfectly well, too bad, that's your fender line now. Otherwise, as I've learned through personal experience, they'll crack, most likely at the seatstay bridge.

    As @yoshy is saying, leather washers are recommanded between the mudguard and both bridges. Also, put a large washer between the mudguard and the head of the screw at the seatstay bridge. Shape it in a vice before hand so that it follows the shape of the mudguard. Or buy one of these from VO.

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