Need to mount two cameras to a single tripod? Perhaps the Slik Multi Arm- a pair of tripod heads mounted to a 40cm bar- can help. The heads have a 1/4"-20 thread for camera or accessory mounting, and can slide freely along the bar, locking in place with thumbscrews; the bar has a movable tripod mount with a 1/4"-20 interior thread for mounting to your tripod. In excellent condition, with minor cosmetic surface wear.