30 CFR 57.19026 - Drum end attachment.
(a) For drum end attachment, wire rope shall be attached -
(1) Securely by clips after making one full turn around the drum spoke;
(3) By properly assembled anchor bolts, clamps, or wedges, provided that the attachment is a design feature of the hoist drum. Design feature means either the manufacturer's original design or a design approved by a registered professional engineer.
(b) A minimum of three full turns of wire rope shall be on the drum when the rope is extended to its maximum working length.