I have a Craftsman 26HP garden tractor with a 48" mower deck, model 917.28748 bought in 2007. I removed the deck to clean and paint and now cannot figure out the routing for the drive belt. In the past I guess I never removed the belt completely. For some reason my operator's manual does not show the deck that is actually on my tractor. It shows a double pulley on the right mandrel. As the photo shows I do not have a double pulley. Can anyone help?