Secondary check ball missing?

I have a 70 Duster, 340 with a holley 3310-2, 750 with vacuum secondaries. Don't know much about carburetors other than what I have read on this site. It's had a bog in it when I get on the throttle, reading other posts sounds like secondary spring needed to be heavier. So I am taking it apart to install the quick spring change kit and a heavier spring. As I separate the housing, there is no ball there which I understand there isn't always one, but then I realize there is no spring in there either. I am guessing that is not right?? Since someone's work seems suspect, should there be a check ball in there also? Can I get just the ball or is that something I have to buy a rebuild kit to obtain.

Thanks
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