Joined: Jan 2010
Posts: 9,818
Likes: 1,790
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
I've worked on a few bikes where the knurled Campag binder nut would just rotate in the clamp ear because the sizing wasn't spot-on.
I always remove the nut and clean the surfaces, the put it back in with a drop od RED LocTite and secure the bolt.
So far, these nuts never needed 2 Allen keys to tighten after that.
I worked on my "new" 1972 Nishiki Kokusai last night, and the solid binder bolt is keyed only into the separate centerpull brake cable hanger.
I have to adjust the hanger angle and hold it from rotating while I tighten the 12mm hex nut.
I think that a normal 6mm Allen key binder bolt would not try to move the hanger so forcefully, but for now I'm happy to keep this one stock.