a9cc56f1____Group_15___2012___GICL_Wiki__3
[0] Tension Spring [1] 1 [2] 1 [4] Hardened steel [5] Inexpensive, lightweight, and desired material properties for a spring. [6] Cold winding [7] Necessary for the cost effective production of a spring. [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).
Gate 3 - Group 15 - 2012 - GICL Wiki