Quote Originally Posted by Brighty83 View Post
This is interesting,
yes otherwise the grit will concentrate in the middle of the stone and dish it instead of lap it.
Japanese use what is called Kanaban, a soft iron plate that allows for the lapping grit to imbed in the plate.

Frankly lapping is a pretty straight forward process, that does not require more than a flat surface and sand paper, if one does not have a DMT.