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I do see a problem. You will always have to keep tightening the canvas by removing the staples. If it is sold or a commission, you would have the wretched prospect of removing it from the stretcher and the frame to do that.
I use Twin Brooks stretchers, reliable, fast service with unique keyable hardware. Just Google them.
What you are using is called a strainer, usually not appropriate in my opinion for professional work , commissioned or not.
Their cross braces are keyed as well.
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