An orthopaedic surgical instrument for use in disassembling an orthopaedic prosthesis includes a main component, a rod, and a spindle. The main component has a housing and an elongated body extending from the housing with a passageway is defined in the elongated body. The rod has an elongated shaft, with a greater length than the elongated body, extending from the head of the rod and configured to pass through the main component. The spindle threads into the housing to move the rod along a longitudinal axis.