Darkhorse Motor Company Universal TIR Tool Kit As leaders in the industry of Harley-Davidson performance & purpose built crankshafts Darkhorse knows the importance of accurate measurements of crankshafts in their installed state in crankcases. It is the primary reason this simple yet Universal TIR Toolkit was developed over and above the original run-out tool that we developed for sprocket shafts only. The engineers and service technicians at Darkhorse plotted out all the different configurations to manufacture a tool that every technician could have in his own personal toolbox. From 1970s Shovels, through the Evolution and Twin-Cam platforms to Late Model M8s, this Universal TIR Tool covers every Big Twin model of Harley-Davidson dating back over 50 years. Features: The tool measures Total Indicated Runout of either the pinionshaft or sprocketshaft with the unique capability to accurately determine what the actual run-out the compensators operate with There are 5 small cylindrical magnets that attach into the grooves of the fine-splines and allow the indicator to also measure if the splines are cut off-center This critical measurement will also tell a lot about premature compensator wear or noise in the primary system Install the supplied indicator in the corresponding laser marked hole and attach to either the camplate mount surface or inner primary using the supplied thumbscrew and rotate tool arm to touch off on the corresponding shaft and you are measuring Tir, quickly and accurately No need for multiple single purpose bulky and expensive tools everyone borrows throughout the shop Complete with protective carrying case Made in the USA