? for AVS rebuilders

These all used either a ball and a weight or a needle so far as I remember

I don't believe they used "just a ball" and they MUST have SOMETHING

no. 38 in the diagram:

http://www.mopar.nl/wp-content/uploads/2009/08/avs.gif

This diagram is small, but I believe 38 --39 depicts the "either" needle "or" ball and weight

http://www.carburetor-blog.com/images/afb_exploded_9000.jpeg