My thought, like yours, Dave, would be to slip on some plastic wire protector slit sleeve, the same stuff that is used in a lot of places under the hood of a car. Perhaps even two sleeves, one outside the other. Taped shut, again just as they do in cars. Cheap, widely available in a number of sizes.
In some cases, a better solution would be a nylon cable clamp as shown in the picture below. Again, cheap and widely available in a number of sizes.
Bill
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