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Use supports to suspend arbor over holes.
Photo © Lisa Hallett Taylor
Suspend arbor over holes by placing bricks, 2x4s or, in this case, pieces of broken cement and 2x4s. The goal is to use the support materials to space the arbor in increments until it's level and square to the ground. Use the clamped 2x4s from Step 7 as a basis for leveling horizontally and the posts themselves to level vertically. Add or remove spacers until you achieve proper alignment.