I think most heads would have bent or broke in that case. And it is my experince that the support rods in most 3d targets are galvinized steel. I have test shot the same ST head into plywood, saplings, a steel drum and the side of my garage (not on purpose, don't tell my wife) and it still flys true with new blades. I think you should send them back if your not happy but at least give them a chance to help you out.