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Sorry about that - I did mean to write 1/8 not 1/4. In fact Lynn actually recommends lapping off about 1/8 if it needs it in his videos. Some might not need it. Mine definitely needed it and it...

Did you lap the 4K? Sometimes you have to lap up to a quarter inch of the Norton 4K side of a 4K/8K combo to get down to smoother substrate. I lapped that much off mine - and it was better but...