I was unscrewing the bolt holding the seatpost in on my newest acquisition (late 60s Bianchi), when one of the little tabs the bolt runs through snapped right off. It looks like the bolt had been way overtightened, weakening both the clamp and the bolt (the bolt was curved!). So my question is whether there is some workaround to repair this without just welding the piece back on. I looked at just putting a regular seatpost clamp on it, but it appears that the seat tube may be too short in relation to the top tube for a clamp to hold. There's less than 5mm from the top of the seat tube to where the curve of the lug begins.
Pictures (click for larger):
Too little space for a clamp?: