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The bolt just holds the end of the tension rod in place. The force that is causing the cracking is the torsion due to the lack of flexibility of that bushing. The axis of the torsional load due to the lack of flexibility of the urethane is slightly different than the axis of the bolt going through the bushing. The bolt, by design, is not supposed to give- so you need something that will flex to accomodate the difference in angle that the center of the tension rod eye will experience when the suspension arm goes up and down. You'd either need a soft bushing or a ball joint. In other words, no matter how tight you make that bolt, it won't affect the torsional load that's causing this problem. To get a good visualization of it, picture yourself hanging a door in a doorway, and one of the hinges isn't mounted exactly in line with the other. That will cause the sweep of that hinge to travel in a slightly different direction than the other hinge, and since they're bolted to the door and the doorway frame, something's gotta give. You'll end up with a hinge that wants to rip off the door jam.
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