(a) The operator shall assure that after the pumping unit is turned off, the master control shall be locked in the "off" position, the brake set, and the means to secure the weights in a safe manner to prevent any movement of weights and/or beam is employed before servicing operations begin.
(b) Braking systems on all pumping units shall be maintained and kept in proper working order.
(c) A wire rope sling of sufficient strength shall be used to handle the horse's head if removal or installation is necessary. The head shall be secured after installation in accordance with manufacturer's specifications.
053-6 Wyo. Code R. § 6-8