I looked at a really old Schwinn 5 speed today. The seat post was one of the smallest I've seen.

The person was complaining that they tighten the seat, but with use, it comes loose. I haven't disassembled yet, but I'm thinking the teeth on the clamp may be worn.

I've never seen an alloy seatpost that size, so I think we would be stuck with the one they have.

Ideas to strengthen it?

I was thinking I could set the angle, then tig weld one half of the clamp adjustment, so that it couldn't move, say on the right side. The other side would still disassemble for installation.

Other ideas?

Oh, also, anybody know if the old Schwinn Messenger seats had standard rail spacing?