Yea, I found out about the weight here also. The bar with the square hole is for install/removal of the weight. The weight just replaces the flywheel nut. It has 4 allen head set screws that screw into the flywheel to keep it in place. Never remove the allen screw with the weight installed. The holes are crimped on the outside edge of the weight so they can't come loose in the ignition cover. If you need to remove a set screw for some reason you have to remove the weight from the flywheel and screw the set screw in toward the crank shaft bolt hole.