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So I'm working on trying to fix the door ding. The piece that's in focus is what I think the culprit is. As I move it in position, ding stops, then goes again when I release it. Come to find out, the out of focus BLUE piece is it. Not sure the importance of this but I threw some painters tape around it and now the ding is gone and has stayed gone. Sweet music to my ears. What is this part and is there any significance to it?