There is a way to take the crystal off without tool 107. You can pull the crown off by pinching it with your fingernails. Then you take some canned compressed air and seal the case tube with the straw and blow the crystal off. You can order a generic crystal off of casker.com just make sure you get your measurements right. Installing it could get tricky since you do need a case press tool in order to get the crystal in. Sometimes you can get lucky by just using your thumbs and pushing it in but one side always goes down a little further down than the other. I would always suggest taking it in to an AD for genuine parts and service.
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