I'm assuming though, Richard, that Tony doesn't want to dismantle the spring just to replace the rivet?
In which case, and since the rivet is only there to stop the clip sliding off, I would carefully grind the sides of the rivet head back just enough to allow removal of the clip - then when replacing simply weld the clip to the upstanding rivet shank (this will not affect the metal of the spring leaf since you would not be welding to this).
Had a better idea Tony - sell the truck to me! :whistle:
Now what makes me think that's not going to happen? :drive: