Originally Posted by
dddd
I repaired an Alan frame with this same exact failure at the seat lug.
I took a cast-aluminum seat tube/post clamp that I stretched open, closed over the lug socket and bolted shut using the tension of an M6 bolt.
It seemed like a durable fix and I remember the rider used it for a couple of years of moderate riding before moving out of the area.
These frames are subject to multiple failure points including the head lugs, so an eye should be kept on these lugs.
OK, interesting. I think that I will stick to my second-favourite outdoor activity, hiking, until my replacement frame arrives in the post (I can't use my backup ride, a steel-framed bicycle, because it's at my mum's house). But if I do need to use the ALAN for something urgent, I'll either try this approach or else the nylon-webbing wilderness-technique mentioned above.