Wherever rope is permanently fastened by a single wrap to a metal object less in diameter or shortest measurement than three times the diameter of the rope, you must insert a galvanized thimble (of size intended for the rope) between the object and the loop of the rope.
Wash. Admin. Code § 296-24-29409
Order 73-5, § 296-24-29409, filed 5/9/73 and Order 73-4, § 296-24-29409, filed 5/7/73.