The Debate Chamber in Dallas TX now has CCTV cameras on pivoting panels above the speakers rostrum. The panels rotate to conceal and reveal the cameras for afterhours surveillance. The pivots have a hollow stem rivet used as a conduit for power and data. These economical pivots are made by 'Angle-Shoe' in Canberra. The PFS35 Flat-Strap pivots are for panels to 35Kg. They were designed for domestic 35mm cellular core doors in square set plaster work. Like all useful products they have many uses.
Image: PFS35 Pivot Set by Angle-Shoe - Canberra