You can make your own "grommets" in place with silicone. After you have run the wires and cables, fill in the exit holes with several successive applications of electrical-grade silicone, keeping the wires roughly centered in the openings. (The number of applications depends on the size of the holes and the amount of empty space to fill.) This is effective for chafe protection but not for strain relief. This approach was suggested to me by a rigger several years ago when I rewired my mast and it has been effective.
Jim Fulton
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