Abstract: A tool adaptor for securing a compression type end connector to the prepared end of a coaxial cable. The adaptor includes two slide members that are mated in an interlocking sliding relationship with the end connector placed in engagement with contoured seats located in each of the slide members. Opposed drive surfaces are located in the slide members that can be engaged between the jaws of a crimping tool to apply an axial force to the end connector so as to radially compress a deformable section of the connector into tight frictional engagement with the coaxial cable.