It's easy to check and see if you have a swadge screw. On the opposite end of the throttle arm is usually the little stop part that hits the idle adjustment screw (most of us just remove this screw). There is a little metal plate that moves back and forth on the shaft. It is usually secured with a small screw. Just take that screw out and now you can rotate the throttle shaft all the way around. Now you can inspect the screw to see if it's been flared out on the end.

If it's flared out, Just hit the end of it with the dremel and a cutting wheel. Slice/grind the end of the screw off. Now blast the area with carb-n-choke cleaner to remove metal dust. The screw should back out without destroying the soft threads in the brass shaft..

When you put it back together, use red loctite. Clean all the threads in the shaft AND on the new screw with a toothbrush and some more carb-n-choke cleaner. Get all the oil off. Loctite is worthless if the threads are covered with oil.