Not to add in to the confusion here but, what you want to do is spread the opening. The area that makes contact with your float pivots and pushes against the needle valve...if you spread this area larger it will cause the valve to close before the float bowl gets to full...thus stopping leakage around the primer. If you open it up too much though, you could prevent enough fuel from getting into the carb...balance things out, and don't over do it.
I have a few carbs laying around that need to be cleaned. If i can find some time this weekend I'll see about trying to get some decent pictures to post up.
After all, a pictures is worth a thousand words...or at least it sure helps to explain things better, lol.

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