WAC 296-806-30010. Make sure belt tighteners meet these requirements

(1) You must make sure belt tighteners: (a) Are substantially constructed and securely fastened. (b) Have bearings that are securely capped. (c) Have a mechanism to prevent them from falling. (2) You must make sure belt tighteners used to activate machinery are securely held in the " off " position by either: (a) Gravity; or (b) An automatic mechanism that must be released by hand.