conduction from the conductive lever 24 to the conductive lead 16 by pivoting the lever 24 around the pivot point 26 the lever 24 may be moved upward and downward so that the center contact 20 alternately connects electrically to upper contact 18 and lower contact 22 a helical over center spring 30 attaches to a center portion of the lever 24 and extends away from the center contact 20 to a support post 32 on the housing 12 to provide a force on the lever 24 tending to engage the lever 24 and support bracket 28 at the pivot point 26 the operator 14 when pressed inward into the page depicting fig2 presses against a wedge plate 34 attached at one end of a rocker arm 36 to rotate the rocker arm 36 counterclockwise about a center positioned fulcrum 38 an opposite end of the rocker arm 36 provides an upwardly extending finger 40 which deflects a center region of the helical over center spring 30 upward to change its line of action 42 with respect to the pivot point 26 the line of action 42 represents a force vector asserted on the lever 24 by the helical over center spring 30 as will be discussed in greater detail below when the line of action 42 is above the pivot point 26 the lever 24 will snap rapidly upward and when the line of action 42 is below the pivot point.