Thanks for the kind words gmguy,glad you got the seat out,eventually!
Springs? I didn't find any that would do this job on mine....
Perhaps they were removed back in the dark mists of time by a PO over the past 60 years.
I haven't tried to mess with the pulley set-up on mine.Just a clean up and lube.
I'm a firm believer in if it aint broke don't fix it!

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.