An apparatus and method for controlling a key lock in a portable terminal are provided. The stack is arranged such that the bars can be separately powered. A semiconductor die is mounted to the heat spreader frame for thermal dissipation. Further, the length L2 of the metallic coil is 0. In various embodiments, the metabase can be configured in different ways. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart.