Cleaning up my weber DCOE 45s and noticed there is a threaded hole on the bottom with nothing in there on the trumpet side.

The carbs do work fine but leak a bit of fuel, ive changed all the gaskets but wondered if maybe there is meant to be a screw in here. Ive looked at the exploded diagra, but its from the top so cant see anything.
Rescued attachment 11092008.jpg

can't see any thing that looks like it should go in there



possably a handy page

http://www.tjwakeman.net/TR/WeberDCOEinfo.htm

still nothing in the hole...



[Edited on 11/9/08 by Mr Whippy]

As above i dont remember ever having seen anything in that hole. Is it a blind hole then or open??

So where do the carbs leak fuel then?? You havent got sticking needle valves / floats have you meaning the carbs are overfilling?? Guess this is a possibility if the carbs have stood with fuel in them for a while