Here is a great picture showing the accelerator pump assemble with check ball. See figures 14, 15, 16. Number 16 would be the pesky little 5/32 aluminum check ball I was missing.

http://www.oldcarmanualproject.com/...h1951-B_Dir/MCarbRoch1951-B_Picture8.jpg


1955 Chevy Cameo
235 engine
3 speed transmission