The Single Spring Operator Assembly with 36 Inch Spring is a heavy-duty and reliable solution for most single spring operator assembly applications. It features a single counterbalanced spring design with a heavy-duty .243 diameter spring wire and heavy-duty cast aluminum cable drums that can hold up to 130 inches of cable. This assembly is available with 89.5 or 96-inch shaft length and is designed for quick and easy counterbalance spring adjustment, with easy calibration to door size and weight for effortless operation. The springs are tested with rust preventative, ensuring long-lasting durability and smooth functionality.