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In most cases the 400 is perfectly adequate for lapping or refreshing a hone, with no need to use the 1k side.

Yup .

There are a few advantages. It's cheaper than the DMT. It's two sided, unlike the DMT. The diamond patterning on the 400 side allows it to clear grit a little better. Unlike the DMT, it has less,...

It's harder than it looks only because you have not yet developed the muscle memory. With practice this will get easier. It's the same as the learning process for riding a bike. What initially is...