I have a 2004 Kubota L3400D. I removed a bolt on the right side (facing front of tractor) on the frame under data plate. When i tried to replace it i can no longer get it to tighten up. I can't get behind it to put a backup wrench on it. It will snug up but when i put the wrench on it to tighten it all it does is spin. The bolt goes through a flat plate that is welded on to what i think is the frame.