My tremolo arm keeps spinning, what can I do?

This information in this article applies to tremolo units up to the Rev 7B revision. The Rev 7 tremolo assembly was the final version to use a screw-in tremolo arm. Starting with the Rev 7B assembly, the tremolo arm design was updated to a click-in mechanism, eliminating the need to screw the arm into place.

For Rev 7 tremolo units and earlier, please first 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.