I was looking at mower...seems to not mow level? In the front of mower there is a u shaped bracket that connects to mower deck on loop end and the other open end of u shape is connected to slots in front of tractor. There is one bolt sticking out near the deck. it is just hanging there with one nut and the other nut is gone. I don't under stand what this bolt does? And I have been mowing with it that way for I don't know how long. I saw a picture on here that looks like there is a spring connected in that area also and I have no spring? Advice of what to do at this point?