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Well to be overly specific; the spring itself compresses and expands. The rod inside the spring doesn't move that much. The recoil power isn't really slammed into the hinge plate, more like transferred. After a lot of use, the spring can become weak. When this happens the grey bolt actually does manage to slam the bottom of the T section of the recoil rod. When this starts happening, the hinge plate is much more likely to break. My spring was getting a little weak so I did a little mod involving washers to increase the spring's resistance.
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