The kiddos were playing w/ the tractor last week & I went to rake my driveway today & the adjustment bar (don't know the name of it) that hooks to the top of an implement and has all the threads on it so you can loosen or tighten it was out of whack. What does this bar do & how do I find the sweet spot again? I tried loosening & tightening it a little but the rake just doesn't seem to work like it did before. TIA!