Zacuto Studio Locking Lens Support has been discontinued, here are some related products you might like:
The Zacuto Studio 19mm Locking Lens Support is a lens support system for 19mm offset rods that consists of several of Zacuto's modular components.
The basic building block is the Q-Mount Studio, which clips onto and mounts underneath 19mm rods. The Z-ZG-16 is a 16" Zipgear that wraps around a lens focus or zoom ring, and is used with the special gear locking tightener to provide a perfect fit. This kit also includes the Z-RE-M2 2" rod extension, which provides extra distance between the Q-Mount and the Zipgear.
More information about Zacuto Products (Link to Zacuto Website)