Abstract: An implant tool for use with an endocardial or other implantable lead having an extendable/retractable positive fixation tip includes a hollow cylindrical housing and a custom designed stylet. The cylindrical housing attaches to a proximal end of the implantable lead. The stylet is inserted through the implant tool and into a lumen of the lead. The presence of the stylet, made from a length of relatively stiff wire, helps guide the distal tip of the lead to a desired implant location. The cylindrical housing includes a body portion and an end portion. The end portion is rotatable relative to the body portion. The stylet includes a knob on its proximal end, and also includes a stub pin slightly forward of its proximal end. The stub pin is received within a slot along the side of the cylindrical housing. Two spaced-apart recesses along the length of the slot allow the stub pin to be respectively held therein.