A system, the system having: a pair of levers; and an over center spring secured to each of the pair of levers such that each leg of the over center spring is received by features on each respective lever, wherein opposing forces on each leg of the over center spring creates a negative torque on a first one of the pair of levers and a positive torque on a second one of the pair of levers when the system is in a first position and wherein the system when in a second position approximately half way to a final position from the first position provides zero torque to the pair of levers and wherein the system when in the final position creates a positive torque on the first one of the pair of levers and a negative torque on the second one of the pair of levers when the system is in the final position.