EXTENSION SPRINGS HANDY PACK

Common Household Uses
Doors and Windows: Used in screen doors and window screens to "snap" them shut after opening. Larger versions are used as counterbalances for garage doors.
Furniture: Found in sofa beds, recliners, and upholstery to support weight and facilitate folding.
Appliances: Critical in washing machines to suspend and balance the drum during high-speed spin cycles.
Toys and Recreation: Essential for the bounce in trampolines and the movement in wind-up toys or pinball machines. 

Workshop and Mechanical Repairs
Hand Tools: Used in vise-grip pliers to maintain grip tension and in staplers to feed staples.
Automotive: Applied in throttle return mechanisms, brake assemblies, carburetors, and trunk or hood latches.
Garden Equipment: Found in lawnmower pull cords, engine governors, and return levers. 

Industrial and Specialty Applications
Agriculture: Vital for farm machinery like tractors, plows, and harvesters to manage heavy pulling loads.
Medical Devices: Small precision springs are used in stretchers, surgical lights, and handheld diagnostic tools.
Manufacturing: Tensioning conveyor belts and providing return force for robotic arms and automated assembly lines.