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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...

Bryghty,
I never heard of this use of the plate, but if it works it is fine.

My question is exactly how are you going to lap a 300x230mm plate flat with an 8x3 DMT?
Second all people that I...

Wait i think I finally understand what you are saying. You do not lap with the granite, you put sand paper on it and lap on the sand paper.

How did you come to the idea to lap with the granite or...

as long as the plate is flat enough, it does not matter what the material is. Micron accuracy is not needed as long as it is reasonable accuracy.