Does anyone know where I can find a tool to adjust the air/fuel mixture on quadrajet off a 86 305 k5. The screws that are in there don't have the conventional heads on them, or even a normal shape. Instead of normal screws that have a slotted or phillips head, they used screws that are nothing but rectangles on the ends. The things just look like slivers of metal about 1/8 to 3/16 of an inch thick. If anybody has any ideas on how to turn these things I'm all ears. I tried needle nose pliers on the one i just tookoff and they screws turn easily, un fortunately I can't use needl nose pliers on the one that is now install because the things won't fit in between the carb and the water jacket. Does GM make a tool specifically for this or am I going to have to rig something up. Thanks for any ideas you have.