A centralized connector module, a refrigeration unit and a method of assembling a refrigeration unit. These actuators are typically used for linear and reciprocating application with a shaft firmly fixed to an armature or central pole piece to convey movement and forces. The base includes a tray having a depending shroud at one end portion. Each of the waves extends radially outwardly from the central region to the vertical rise portion. In each column, the diffractive element is oriented in a direction other than the direction of the elements in the neighboring columns. The improvement in the process comprises the steps:.