If you don't have the original belt that is intact, then you will have to do some measuring. Measure the diameters of the two pulleys, the width of the outer part of a pulley groove (the belt area, not the outer pulley metal), and the shafts center-to-center distance between the two shafts. This will provide information with which to select the proper belt. Go to an auto parts store or well equipped hardware store--they can input those measurements into a formula to select the proper belt to buy. Even with an exact replacement, you will have to shift the motor position to install the belt and adjust it's tension afterward. The belt should have about 1/2" up-down play in the center of the belt between the motor and tool. Recheck the tension after a few days of running because the belt will stretch a little after first use. Make sure the two pulleys line up parallel so that the belt is not being bent sideways in any way. Hope this helps!
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