I protetced the plug wire with a rubber grommet. I driled a hole where the plug wire would hang straight down from the side of the engine box, to keep it as far away from the muffler as posible. I used a 3/8 rubber grommet, and split one side so it would fit around the wire. after drilling the hole in the cowl, I made cut from the hole to the edge of the engine cut out for the wire. Use a small piece of light plywood to reinforce where I made the cut.

I used MS paint to modify this cowl picture. the black is the hole and slice, dark blue is the ply reinforcement, and lite blue are the servo screws atatching the wood. sorry for the fuzzy imiage. I ain't minnflyer