Thanks Kevin . . .

I could not find a position for the large spring under the seat although it was in the "seat" box? I like your idea . . . I found nothing in any of my books or the 49-53 truck shop manual. Seat moves easily forward and back after my refurb on the seat glides. The seat adjuster lever spring is in place and working well. I think it is much shorter and smaller diameter? Next time I have the seat base out I will check for the holes you mention. If there had been two, I might have thought about this solution . . but only one spring?

I thought the shorter one was part of the carb linkage but that one is already replaced, smaller in diameter and longer.

Thanks for your suggestions!