on 149C. The contactor148C extends laterally inward from and generally perpendicularly at a position, in the example configuration, near the vertical midpoint of the lateral side wall 142C. The extension 149C extends generally inward from the contactor 148C at an angle 151Crelative to the contactor 148C. The angle 151C may be less than 180 degrees, such as about 150 degrees, although other angles