The multi-purpose Universal Mount is a self-hanging clamp that slides along SYMPLA rails & locks in position with a single locking lever. The Universal Mount is the basic structural element for numerous SYMPLA components (the Flexible Mattebox, Shoulder Pad, V-Offset, Body & Lens Supports & Adjustable handles all attach to SYMPLA Rods via Universal Mounts) & it can also support external accessories. This makes SYMPLA an easy & intuitive system to use & adjust, because once you know how to adjust a universal Mount, you can adjust all the components built around it too. It has an ''''open hook'''' design, which allows it to be inserted & hung on the SYMPLA rails from below, with one h&, even between other elements that have already been positioned. Because it's self supporting even when unlocked, it stays safely attached to the rails at all times. A single, repositionable locking lever conveniently blocks the Universal Mount solidly against both rails with one movement. The Universal Mount is extremely versatile, thanks to its industry standard 4 x 3/8” female threads & 2 x 1/4” female threads, which can be used to attach arms, adaptors & other components & accessories to a SYMPLA rig.