So why doesn't the parts breakdown show figure 17 on the 41FD790A034? I've looked at all other similar Ryobi models and no matter which figure that part is labeled, it is always omitted on the breakdown. This bracket assy keeps the trimmer head straight and allows you to loosen up to pivot the directionally. It is directly between the lower and upper shafts where the big screw knob goes. Can I get any help?