BBQ was the first thing that popped into my head too, now a couple steaks on the grill sound pretty good. This has me thinking- Why is it so aggravating to spend 3 hours putting a grill together, yet you can fiddle with a Willys carb for three days and be happy as a clam?
I suspect this was used on the intake manifold carb mount stud to hold the throttle linkage return spring.... It was in with the loose parts as the carb was off when i got it...