5-F

This is a vintage Aero-Motive tool balancer model 5-F. This model has a weight capacity range of 1 to 5 lbs (or 0.4 to 2.5 kg). It was manufactured by Aero-Motive Mfg. Co., a subsidiary of Daniel Woodhead, Inc., based in Kalamazoo, Michigan. These devices are used in industrial settings to suspend tools, making them feel weightless to the operator and enhancing ergonomics. Aero-Motive products were especially popular in: * Automotive plants (suspending impact wrenches, grinders, etc.) * Aerospace (torque tools and specialty instruments) * Food processing and packaging * Appliance and white goods manufacturing * Maintenance workshops * Electronic assembly lines