Larr,
I know exactly what you are talking about. If they are peened in place and they are slipping, that presents a unique problem. I wonder if it would be possible to drill a very small hole between the end piece and the bolt. Then you could tap the hole and insert a small threaded bolt, grind it flush and the wheel would be keyed on there. I know that when they do stitch repair on engine blocks, they use small threaded rods to fill the crack in this manner.
There is a discussion on pot metal welding on the Old GMC Truck site, in the metal shop. You may get some answers there. Also, you should definitely ask this question on the VCCA site.
