I haven't used this coti too much but decided to run a pencil across it to find it needed a good lapping. I'm down to the last spot as you can see in the pict. a little dip there and it's been a couple thousand laps and still not done.
My other coti lapped fairly well but this one is killer. I'm using a 1k dmt.

I don't have much experience with these stones can someone tell me if this is normal?

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