Another sign that it’s time to change your belt (or close to it) is when the grit itself begins to clog. You’ll notice spots or streaks on the belt where the material is fusing to the grit bed.

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Question: My seat belt seems to be wearing out. The buckle doesn’t always work right and the belt has some frayed spots on it. Are there any rules about replacing it? Can I just go buy a used one from ...