About Zacuto Shoulder Stock The Shoulder Stock is an additional point of contact and stability for your Smart Z-Finder rig. It locks into the Bridge with a quick release lever. Adjustments can easily be made with one hand while using the rig. Change the length from 9-14″, adjust the angle of the rod, or articulate the stock to accommodate your shooting style. This must be used with the Zacuto Bridge! Zacuto Shoulder Stock Features Additional point of contact and stability for your Smart Z-Finder rig Locks into the Bridge with a quick release lever