thats odd posted by gt300zxtt on February 25, 2009 at 10:50 AM
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The 2x4 risers twisted away from the top plate. This twisting happened while raising the car one side at a time, too add blocks incrementally. This set was also assembled with nails, not screws, so that could also have been a factor. Regardless, the interlocking between blocks, and additional bracing, provided by the lower cross-bracing is in my opinion beneficial.