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2. The 2x4 must fit snugly between the wheel’s inner rim lips. Measure the maximum width between the lips (17 3/4 inches here) and saw the board to match.
At-Home Alignment Made Easy

 2. The 2x4 must fit snugly between the wheel’s inner rim lips. Measure the maximum width between the lips (17 3/4 inches here) and saw the board to match.  View Related Article

 

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