I have never used a device like this so take my review with caution. I was annoyed that I couldn't pull the paper tight enough to lay flat on the surface, and it was also extremely difficult to spread the ends out so that sharp objects would pierce the paper. Like you need a third hand (or someone else to help you). Maybe I'm doing something wrong. The ideal design would be sharp objects with a slant so you can just slide the paper in and it will snag when you pull it back (no need to spread the block).
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