1. The method of forming a dual safety interlocked tension spring which comprises the steps of forming a first coil spring, forming a second coil spring of similar pitch and size to said first coil spring, positioning the springs end to end, inserting an end portion of the end turn of one of the springs under an end portion of the adjacent end turn of the other of the springs, and rotating the two springs relative to one another substantially about a longitudinal axis of one of the springs to screw the springs together the full lengths thereof.

3. The method of forming a dual safety interlock tension spring having connecting means at each end thereof and connectible between two points in an apparatus to exert tension forces therebetween which comprises the steps of positioning two substantially straight spring wires in substantial parallelism and in preselected positional relationship to each other, advancing an initial length of the wires to establish a straight length, forming the two spring wires starting at a point following the straight wire length concurrently into a substantially single-layer double-wound coil while substantially maintaining said preselected positional relationship between the wires during the coiling, and severing the wires at a point spaced from the completion end of the coil to establish a further straight length, and forming all four of the straight lengths to a connecting configuration.