Just need to play the system. Get a battery powered circular saw ($40 for a no name brand). Go home, charge the battery, go back a few days later, but the wood, cut it in the parking lot (use the 2x4 as a straight edge). Go home and build it. Blow off the saw and put it back in the box. Return it and tell them it didn't work right and they will credit your debit / credit card. I do that with odd size wrenches I need when working on the camaro.
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