How do you remove a screw that keeps spinning?
The conventional method is to remove the screw using forceps, haemostats or a screwdriver coupling device to grip the screw head while rotating the screwdriver. However, there is often only a small amount of screw head exposed, which is not enough for the instruments to grip.
How do you remove a nut when the bolt is turning?
Best way: put a wrench on the nut and the proper driver or socket into or over the head of the bolt, and turn one while keeping the other stationary. Second best way: put a wrench on the nut, and a pair of locking pliers on the shank of the bolt.