I do a lot of electrical work by myself, and I mostly run conduit. Although pushing fish tape into conduit is easy, pulling the wire back through is not. Regardless of how well I reamed the end of the conduit to remove burrs, I found that my solo wire pulls still nicked the plastic covering on the insulation. Also, the point at which the wires attached to the fish tape, no matter how well taped, always seemed to catch at the fitting inside the box. It was the combination of this fitting, the taut wires, and the 90° bend into the box that caused the problem. The solution turned out to be a discarded caulk tube.
I cut a funnel-shaped wire guide out of a spent plastic caulk tube. Its triangular tip extends into the fitting that secures the conduit to the box, shielding the wires from this sharp corner as they are pulled past it. In just a few minutes, I finished the pull without causing any damage to the wires.
Kenneth B. Best, Elmhurst, IL