Bought a HandySLR rig from a fellow user a while back and it is awesome; however I seem to have missplaced a part for it and can't locate it around the house. It will probably show up though I'd like to see if I can't get a spare to have. It's circled in red on the attached picture and I can't seem to locate any parts for that particular rig (I believe Handy is now Edelkrone)

Any help would be greatl appreciated