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Super common. And it shouldn't get worse. Just flatten the ridges down smooth and use it. It should stay that way. You might get a slight ridge. But nothing like what you have now.
The steel bite guard, they didn't realize it would be a problem mainly cause the cogs were all bolted tight. Not single cogs loose. That's the problem. The SRAM cog has a single bolt thru it, unless you pulled it. But when you have all 3 bolts in like on a SHimano, and have spacers with splines, it doesn't happen. So they didn't know. Now they do. And they have the bite guards.
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