Hi all,

I have a steel bike with the seatpost binder integrated into the seat-tube and seatstays (this is a Serotta C3S very similar to an Atlanta). One side of the binder bolt is of course tightened with a hex key, the other side is neither machined for a hex key nor is it hex-shaped to fit into the frame. Consequently it can spin freely within its side of the seatpost binder.

I got the frame used, and upon buildout I removed the binder bolt for cleaning and have since discovered that I can't fully tighten the bolt -- the "free" side of the bolt simply spins when I approach adequate torque; there is no way to keep it fixed.

I can kind-of cheat it to get it close to torque by applying (a lot of) force with my thumb and tightening the other side, but I would rather be able to get it to work properly. How can I get this nut to be stationary?

Options I've considered: 1. A dab of some kind of glue - downside is that I'll then have the damn thing glued into the frame, and I'll risk gluing the threads. 2. Dremel a slot for a large-ish standard screwdriver - downside: hackish, rust-o-riffic and possibly weak. 3. New binder bolt with allen keyholes on both sides (like the Campy one on my wife's Torpado) - downside: I have to search around for the right size, and then I'll have to carry 2 hex keys just to adjust my seatpost.

Any ideas? How was this system originally supposed to work?