Missing carb. screw?

[Stickman400]

I was taking my carb. apart earlier to clean it and put in a bigger main and I saw this little threaded hole beside the overflow screw that looked like it was missing a screw or something. I looked at the exploded view of the carb on motosport and it doesn't even show the hole. I took a couple pics of it, anybody know if there is supposed to be something in that hole?
http://i683.photobucket.com/albums/vv192/Stickman400/Quad%20Pics/IMAG0304.jpg
http://i683.photobucket.com/albums/vv192/Stickman400/Quad%20Pics/IMAG0305.jpg

[CJM]

The correct size brass screw from a hardware store could be used I guess.

Mine has a screw, not sure wtf it does. If the quad runs fine Id let it be, maybe seal it up with rtv if you cant find a screw that fits.

[Ridiculous]

does it just dead end or what?
if so i wouldn't even worry bout it.