1. Read the rules. The exact rule says, "No portion of the bridge may extend below the top surface of the Test Supports (4.b) prior to testing."
2. Read the forums. There's been a thread with almost the exact same title here: viewtopic.php?f=189&t=6133
3. Read the rules again. The loading block can be at any height along the bridge's height; however, the bridge itself must not extend below the surface of the test supports.
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