So I finally got around to getting my powerhead out again. 150hp inline 6. All the bolts around the bottom are loose. I can rock it back and forth, it's obviously not stuck. I built a little frame out of 2x4's above it, and tied two ropes to the flywheel. Me and another guy pulled on the ropes as hard as we could, it's as if it's still bolted on. Any ideas?