invention is that connector wall 72 is thicker than those of more traditional connectors without increase of the outside diameter this allows connector 70 to withstand more torsional stress than a standard connector the added thickness of wall 72 adds strength to the connector in addition the tapered threading allows the connector to transfer a rotational motion through both shoulder 82 and bore 80 as explained above spreading the transfer of rotational force over a larger surface area allows the connector like the pin to withstand more force additionally connector 70 has a pair of opposed shoulders 82 each shoulder 82 has a roughened surface which mates with surface 82 which is similarly roughened this significantly increases the coefficient of friction the mating of the roughened surfaces helps transfer rotational movement of the pin to the connector the mating of the roughened surfaces also prevents the pin from further rotation once the surfaces mate with each other finally fig5 illustrates a side view with a connector 70 partially cut away the pin 60 has been threaded into and fully engaged with the connector 70 the connector 70 also includes an internal secondary stop 90 which has a diameter less than the diameter of the pins at their farthest most end when each of the pins 60 is threaded into the connector 70 the end of the pin is spaced slightly from the internal stop 90 in the event that the pin continues to rotate with respect to the connector 70 it has been found that it may cause the threaded portion of the pin to continue to elongate in the event that the pin continues to elongate with further rotation the internal stop 90 acts as a.