Long running shows that utilize a lot of moving lights (think Broadway, Las Vegas, theme parks, or cruise ships) regularly remove moving lights from the rig for repair and maintenance. Unless the new fixture is placed in exactly the same spot as the old one, refocusing is required. City Theatrical exclusive Moving Light Hangers allow moving lights to be swapped out with the new light in absolutely the same place as the old one. The key to the design is a tapered alignment seat that locks dead on, removing all possible variation. Read this new safety document for Moving Light Hangers' Tee Slot for Integral Split Coupler (P/N 138), Tee Slot for Unistrut® (P/N 137), and Tee Slot (P/N 130) to learn more.