Vaccum leak on Edelbrock 1406 carb

[lukecp]

I have a Edelbrock 1406 on the 350 in my truck. Lately, i have been plauged by a vaccum leak that i though was the base gasket on the carb. After replacing the gasket, the vaccum leak was still there. So, to find the leak i turned the idle down to around 300 rpm, and tuned it very lean, and used a can of gumout to find the leak. I finally found the leak. It is on the throttle shaft, where it comes out of the carburator on the side with the electric choke on it. It seems to be where the golden colored rod enters the carb body. The rod seems to have some up and down play in it too. How can i fix this vaccum leak? The carb is about 8 months old, if that matters.