A system for securing a residual limb having a sheath, thereabout and a strap emanating therefrom through the socket of a prosthetic limb or the like, utilizing a uniquely configured and operated lever which is specially designed for the task of pulling of the strap from the exterior of the socket to urge the residual limb therein. The system uses the tool, in pivotal communication with the prosthesis, to provide efficient pulling force with less effort, utilizing lever action. The preferred embodiment of the tool comprises an elongated body having specifically formed first and second ends, and has formed therethrough at least one passageway to receive the strap from the sock.