I stand corrected. Chicago grip. I found one for you here, at
Karl Kuemmerling.
The cable gripper I used to use, the one at the bottom of the mulch pile known as the 'Porkchop' I bought from an industrial rigging supply,
American Wire Rope and Sling. It was called a Klein grip and worked really well. It looks something like, well, like a porkchop:
