A tool includes a base with first and second ends and sides. First, second, and third openings extend from the first end. A slot in the first side communicates with the first opening for receiving a cutting tool. Another slot communicates with the second opening for receiving a marking tool. The third opening forms a stop surface. A recess in the first side and in the second end defines a platform. A channel extends from the third opening thereacross to second end. Two pins project on opposite sides of the channel. The base includes a stationary portion on which the pins are located and a pivotal portion defining the second end. The stationary portion defines a supplemental end surface facing parallel to second end. A cutout aligned with the cable channel extends from the platform to the second side and from the supplemental end surface into the stationary portion.