MSHA recently became aware of a backbiter rivet shearing, causing the keeper on the snap hook to detach from the unit.  This resulted in the loss of dual-action functionality of the snap hook.  Sperian Fall Protection, Inc., which represents the Miller brands, issued a letter to their customers instructing them to conduct a daily inspection (by the user) and a periodic inspection by a company-appointed competent person according to the manufacturer’s instructions.