New to the forum but this looks like a great place to get help! I have a 1980's John Deere 160 riding mower. My father took the deck off without taking a pic or video of where all the parts went. We got the blades sharpened and put the deck back on. However, the top main pulley is way too loose. Not the pulley intertwined on the deck itself, but directly above it. It's too loose and I don't know how to make it tighter. Also, there is a black spring near the back middle of the deck that is attached but I don't know where this attaches to the mower. Anyone have a manual for the 1980's 160 model? Thank you.