My tremolo arm keeps spinning, what can I do?

Firstly, please consult the information below, regarding installing the tremolo arm.

Carefully insert the arm. Turn the arm clockwise until it stops. DO NOT OVER-TIGHTEN. If you keep turning beyond the point where it stops, the arm assembly will break. Turn the arm counter-clockwise at least 1 turn, to its playing position. Use the set screw to determine the torque needed to turn the arm.

If you are unable to get the tremolo arm to engage in the screw inside the attachment, it is possible that the screw at the bottom at the arm attachment has come loose. Please consult this topic for more details.