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3 frame corners square, but 4th not.
I'm reassembling my frame to make sure it's 100% square, and I have run into this problem. in Frame assembly step 12, I'm checking the frame for squareness, and 3 of the 4 corners are square. am I incorrect in assuming that the only way it can be true is if my square measure tool is bent (i checked that a coulpe of times), or one or more of the 3030 extrusions are not the same length or one is slightly bent?
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