Birmingham Trades & Sales

You can get seatposts which expand like a stem. Also wedge posts which are tapered and just jam into the hole. You could use it for something like polo for a while I am sure. You are not exactly going to die if one of the seat stays snaps off are you? but dirt jumping, nope.

I would enter that in to the 'David Blunkett school of welding and fabrication hall of fame'

A truly shocking repair sorry...