Just bought a B7100 w/Belly Mower from a guy who didn't know much more about it than me. I am unable to find the height adjustment for the mower...also, on the left side just below the foot board, there is a chain hanging from a U-bolt - approx. 8-10" long with a "turn-buckle" at the other end - it is unattached & clearly needs to be hooked somewhere - what do I need to do, please?