Joined: Jan 2010
Posts: 9,813
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.
The screw slot is a contingency for if/when the bolt were to break, to allow easy removal of the threaded remains of the bolt.
Good design all around.
Since binder bolts fail through the combined forces of bending, tension and torque, keeping the threads greased will help prevent bolt breakage, by reducing the torque needed to secure the post.
Last edited by dddd; 12-12-18 at 11:06 AM.