No matter how careful you are you’re probably going to hit or knock your canvases at some point and get a dent in them. As much you push the dent back out from the underside it won’t work, that’s because the fine canvas threads have been stretched in that area. Even if you fit the canvas tightening wedges that come with most canvases into the corners, it still won’t work. So let me show you what does work:
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