The most commonly ordered option for a rotating top is a form of holding the top in position. There are 2 common holding options such as a rotating top “detent”. The operator slowly rotates the top into a pre-determined position and a spring loaded detent engages in a “dish” in the underside of the rotating top. The rotating top is held in position until the operator applies a gentle nudge to the rotating top and the top rotates off the detent and onward. A positive mechanical rotating lock is also available. As the name implies a locking pin is engaged into a predrilled locking ring located on the underside the rotating top creating a positive lock. The rotating top is securely held in position until the operator removes the locking pin thereby allowing the top to once again rotate. These are the 2 most common options; more are available and all are based upon the actual application.