Once apon a time, I built a canvas. I had built other canvases before, but this one went really wrong. It turned out bad, so bad that it couldn’t be fixed. So I had to destroy it. I took the canvas off and took the wood frame apart. Then I decided to build a new frame, this time with proper tools and better instruction than before.
Moral of the story: When you build a canvas frame and mess it up, just build a new one!