the clips with the slots for the chain attaches to the tractor top link. One clip on the outside of each side of the ball. So the top link of the tractor, clip ,ball ,clip, tractor top link. All held in place with the normal pin and clip. The chains run up from the mower deck and are attached to the slots in the clips. The chains Keep the mower deck hanging from the tractors top link. When you raise the three point up and then lower the mower it will always be hanging at the same height. If the mower is level just count the same number of chain links on each sides- add a zip tie and you will have a reference point. IF you see someone mowing stop and check their set up out. Far easier to understand when looking at it.