Disclosed is a sprinter training aid which pulls the sprinter forward in an over speed condition, for the purpose of exercise the muscles which pull the leg forward when running, such the hip flexor muscles. A method for providing routing component level high availability includes synchronizing information from an active information source, detecting a failure in a routing component, replacing the failed routing component with a backup routing component, and completing synchronization of the information. The apparatus includes inputs for signals from instruments measuring height, flight path, and location of an aircraft, as well as an input for an instrument providing information about geographic features of terrain surrounding the aircraft. The knife assemblies are adapted for installation between the end plates such that the shoulder portions of at least two shoulder bolts extend through one of the end plates into the base. The flat plate is wrapped, along a surface of the plate, around an outer periphery of the stabilizer at a predetermined position thereon and clamped, the cut-out step portions are overlapped, and both of the end portions are fixed at overlapping portions thereof. The apparatus may conveniently be provided as a discrete delivery unit, with the storage chambers prefilled with the selected reagents.