Learn how through this video tutorial byMaker Grayon YouTube.
You should also ensure that the blocks are installed evenly using a level bar.
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Step 2
For the rest of the framing, use 2 by 6 boards.

Image Credit: Maker Gray via YouTube
Continue this process to build the rest of the rims in between each post.
*All these images are credited toMaker Grayvia YouTube.
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