help need...?? what screw is the idel screw on a 300ex..??

go to google and search on the IMAGE side of google, it should be able to give you a diagram otherwise search for a manual
 
The idle screw is going to be the one right in the middle of the carb that goes straight[has a spring on it].Should be the only screw on the side of that carb. I think the idle mixture screw comes up from the bottom just ahead of the bowl..