I have an early 80s model simplicity 728 riding lawn mower and the belt fell off after hitting a dirt clump with the blades. I need to know how the V belt goes back on that allows the blades to start when u engage and disengage the lever. I have the pulley on the mower deck, 1 double pulley on the crank and 2 pulleys in front of the mower for that belt. Its a longer V belt and need to know the proper routing for it.