👉 A windup is a mechanical device that allows an object to be lifted by the force of gravity. It consists of two metal balls attached to a chain, which can be adjusted to increase or decrease the weight of the object being lifted. The chain is typically made of steel or other durable materials and may also have a pulley at one end for further control of the lift. Windups are commonly used in construction and engineering applications where lifting heavy objects requires the ability to quickly and easily raise an object