Abstract: The adaptor for locking the internal components of a torque converter including a mandrel or pin having first and second end portions. The first end portion of the mandrel extends into a torque converter opening to engage the internal components of the torque converter. A collet of the torque converter circumscribes the mandrel during this extension. An intermediate element having a hollow end portion is capable of fitting over the collet and the second end portion of the mandrel. An intermediate element is fastened or fixed to the mandrel which may be interchangeable, dependant upon the particular torque converter being stabilized. A bushing is interposed the intermediate element and the collet and maintained in this position such that the open hollow end portion of the intermediate element, the bushing, and the collet are sandwiched together.