Improved interconnects are produced by injection molded solder which fills mold arrays with molten solder so that columns that have much greater height to width aspect ratios greater than one are formed, rather than conventional flip chip bumps. The melt processing can take as a batch process or in a continuous process. When the current flowing through the motor becomes greater than or equal to a threshold, the supply of power to the power plug lock motor is stopped. The displaceable tool is brought back to its starting position corresponding to the predetermined width of the workpiece nest before a new bundle of workpieces is loaded therein.