A screwdriver balancer (or tool balancer/retractor) is an ergonomic device used on assembly lines to suspend electric/pneumatic screwdrivers, making them feel weightless, reducing worker fatigue, keeping the tool ready for use, and preventing cord damage by retracting it to a preset position. It uses an internal spring and cable to support the tool’s weight, with adjustable tension for different tool weights (e.g., 0.5-5kg) and features like manual locking for safety and position