input: [0] Tension Spring [1] 1 [2] 1 [3] Provides the necessary tension that keeps the lower blade guard in the “closed” position when the saw is not in use (provides a “passive” safety ability that eliminates the need for the user to close the guard after each use). [4] Hardened steel [5] Inexpensive, lightweight, and desired material properties for a spring. [7] Necessary for the cost effective production of a spring. [6] 
output: Cold winding