The bow is bent, and I have come up with many ways, such as heating it, which not only damages the paint but also makes it easy to break. I recently came up with another method that works well and is safe: use a wooden square (with the length and width of the bow), place the protruding side of the bow against the wooden square, fix the bow heel and bow tip with thin wire, and then fold paper into a small square strip (the thickness depends on the curvature of the bow), fill it between the wooden square and the bow, and let it protrude in the opposite direction for three to five days. Attention: Take it off every day to check how much is still missing from the straight line, in order to adjust the thickness of the paper strip. My bow is perfectly straightened like this. Hehe, everyone, give it a try.