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I have already walked that mile. I got a quarry full of natural finishers.
Slowly I bought once synthetic at a time. 2 years later I feel that the naturals are DULL compared to the synthetics.
Or...

I have one as well. Ebay special. lapped it and polished it to 1K.
Test, test,test. 25 laps test,25 more test.
Slurry and pressure changes all parameters.
My 12K doesnt autoslurry. Water and...