Yesterday when my welding mate was repairing a wear spot on the front 6 inches of one of the chassis side rails, he nicked one of the spring hanger rivet heads with the angle grinder, removing a sufficient amount of material to make up my mind to remove both spring hangers to check for rust.
I had thought about doing this off and on for the last few weeks, so this gave me a reason to do so.
Was it overkill? I don't think so.
There was enough rust ticking away underneath to justify the hour or so to remove and refit the hanger, with 24 hours of rust buster in action in-between. A coat of etch primer and top coat was applied to both surfaces prior to assembly using high tensile bolts and conical lock nuts.