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The 12k shouldn't be producing any new scratches that weren't there in the first place. Reading up on some another site about Jnats it was suggested that scratches that suddenly appear at the end of...

It's not easy to diagnose but it's possible that you may be overdoing it on the 12k. Generally I don't go beyond 15 laps on the 12k. It cuts fast. But it's hard to say if those few extra are your...