The pedestal to beam clamps, which also serve as feet for the device, are hinge components for a chain link fence gate. These came from Lowes. The 3/8" carriage bolts clamp the pedestals securely in place when tightened, but it's a bit tedious to get them tight while maintaining a precise position of the pointer -- but it's essential. DO NOT BUMP any of the movable parts after setting the measurement!
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