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Grethe, cropping a canvas is easy. The first thing to do would decide how you want it cropped. I do this by taping adding machine tape to my painting, trying different croppings until I come up with what I like. Then I measure and move the measurement up or down to the whole inch so it will fit on new stretcher bars. Removing the canvas from the old stretchers is just a matter of taking out the staples or tacks. Aligning the new stretchers correctly on the painting can be a bit tricky so what I've learned to do is put straight pins into the exact corners, and with a pencil mark the back side of the canvas where the pin comes through, then you have your placement for the new bars.
The next step is stretching the canvas which I won't go into here because Garth posted a good demo on how to do it. It's called "Successfully stretching preprimed linen." I'm sorry but I don't know how to refer you to it the right way, (I'm rather computer challenged) maybe someone will help me out and do this for me? Or you can find it through doing a search.
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