What is commonly referred to as a "knuckle buster" in rigging?

The term "knuckle buster" is commonly used in rigging to refer to a clamp that is employed to mark trim. This clamp allows riggers to quickly and effectively set or adjust the rigging height, which is crucial for ensuring accurate performance setups in theatre environments. The nickname "knuckle buster" likely comes from the potential for riggers to accidentally hit their knuckles against it during adjustments, particularly if the clamp is positioned in a tight or awkward space.

In the context of rigging, proper marking and adjustment of trim are critical for safety, aesthetics, and performance quality. Understanding tools like the knuckle buster helps riggers ensure that they maintain precise rigging heights and safely manage the scenic elements and lighting in a production.