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Step 6: Concrete

I used 1 1/2 80lbs bag of fast setting concrete for each mold. Once the mixed concrete was poured into the mold, I first tapped it all around with a rubber mallet to reduce the amount of bubbles. Next, I marked out where the center of each 4x4 will go and then I placed each j bolt at that position. I tried to be really careful to make sure the bolts went in just right, and that they were nice and square.