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I used it for repair as the torsion spring of the catch of the post of the mail post used about 20 years was damaged. This ball catch is a compression spring, and its compression amount can be adjusted. Since the lid can be reliably closed and adjustable so that opening and closing can be performed smoothly, setting suitable for the purpose is easy. Also, I think that the life of the compression spring will be longer than the torsion spring because the risk of the spring breakage is reduced.