Ok, here's some pics.
first one is the hub where the tab that supports the arch bracket is welded. (there's one on the other side of the hub too that's hidden in this shot)
1DSC_0505 by
paul ward, on Flickr
and this is the arch support itself - the 'nodular lump at the bottom is the latest temporary repair where the tube sheared off.
DSC_0026 by
paul ward, on Flickr
DSC_0025 by
paul ward, on Flickr