Update: I used heat shrink. Filled in the chewed areas with liquid vinyl electric tape (Gardner Bender) then put the heat shrink tubing on over that. I did buy some of the rubber splicing tape but it was too thick and I couldn't get the heat shrink tubing over it so just stuck with a few coatings of the liquid electric tape. It worked out very well. Of course that meant that I had to cut the plug off one end. I ended up replacing it with good one. I've used to many cheap ones that were hard to wire and worse than the molded original. The plug that I go was made by a Legrand, made in U.S.A. and was a quality part. It cost $15 which sounds crazy but it was worth every penny. It had various sized rubber compression grommets to fit different cord gauges. Each part was grooved and slotted so it was not possible to make an assembly mistake. The wiring had color coated screws and you just pushed the stripped wire end into a hole and then screwed it down. So, $15 for the plug, $7 for the heat shrink, $5 for the liquid tape. So, I'm in $27 to fix a $90 cord but it is fixed properly and safely and should last a long time.