So i have this problem that my idle adjustment screw (the one in the intake) is stuck the engine is a b230a and someone has broken the flathead part of the screw so i ordered a new one and tried to get the old one out by first with pliers and got it to turn a couple turns. then
​​​ i hammered a flathead in to the screw and got it to turn some more and eventually drilled and tried with those reverse drill bit things that should get the screw out but they too just spin, so if anyone has removed the screw before and has any tips i would be grateful