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I have used the Ch12K for a number of years. I do not use a slurry on mine. I always do 100 + laps and it works just fine.

Yes, each blade seems to be a bit different. You just have to expect that.

If it ain't broke don't fix it !:)

Congrats on your success and thanks for letting us know what you did.
The real test will be if it works on the next 3 razors.
FWIW, it usually takes me at...