Never say impossible! The rusty bolt head is the upper-control-armretaining bolt that goes through the frame. The bolt can be tapped outof the frame from the inside where it goes through the control-armshaft. Then the control arm can be removed. The downside is, the bolthas a serrated surface to prevent it from spinning in the frame wheninstalling shims during alignment. Repeated bolt removal makes the boltloose in the frame. Carefully feel the serrations in the frame and bolt,then line it up before tapping it in place, and it will stay tight.