Abstract: An assembly for use in conjunction with a fulcrum device of an automatic screw machine wherein the cylindrical housing thereof includes a pair of longitudinal recesses disposed on opposite surfaces thereof. The recesses include threaded counterbored openings for receipt of set screws such that the ends of pins supporting a pair of chuck levers may be contacted thereby when the set screws are upwardly moved. The pins are symmetrical and include an end extension which is adapted to contact the upper surface of the set screws and in this fashion secure the pins at both ends thereof so as to insure their fixed position within the housing. In addition, one of the counterbores is of a shallower extent than the other so that such counterbore, in effect, forms a stop end wherein the screw head mounted therein always contacts at least a portion of the pin. In addition, the pin may be positioned end for end so as to, in effect, double the wear life thereof.