Assemble the bars together and square the corners...I put a few staples in the corner to keep them squared during canvas attachment. Center the canvas, primed side down, staple one side in the middle, then stretch and staple the opposite side in the middle, then continue with the other two sides. You may now work on one side at a time stretching and stapling, folding and stapling corners, rotate the same way so your corners will all be stapled the same. I try and put a staple about every 1".
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