Peter, it's happened to the A1. You will need to source an appropriate length and size of tube to weld back into the "left over" bracket.   The tube can be a lot heavier than the original.
I put the A1 on a bike trailer and took it to a welders to fix. I think I was charged $20.


Ron
Mildura
GTR-AUS #20

To quote Leonie Bressanelli "It's all about the bike"