Has anyone ever seen a supplemental external clutch return spring on a 65 GS? I am working on James's car still and there is a spring hooked through the cotter pin hole at the lower z-bar end of the adjustable link. The other end is attached to a bracket that is attached to the engine by one of the starter mounting bolts. The bracket looks production like and not something homeade, so that is why I am wondering if this is some kind of dealer retrofit kit or something?