I also had some issues with one of my nortons, I think it was a 4K. I had lapped it with the Norton lapping stone and I now believe it had imbedded some particles into the 4k.

I could feel clicking on the blade and noticed micro chipping under magnification. I scrubbed the blade with a 3M nylon pad until it felt smooth, sharpened a couple of kitchen knives on them feeling for clicks, then re-lapped with sand paper, then diamond plate.

I’ve never had a problem with them since. I just touch them up with a diamond plate occasionally.

I agree the 4&8k are the workhorses for me as well. Maybe you do need to get past the top 1/8 inch on some of them.


Marty