I have read several threads here about end grain cutting boards and the direction of the grain in regards to expansion and contraction. It sounds like you need to use quarter sawn lumber if you are going to make an end grain cutting board, or atleast the grain runs straight from one side to the other. What if you don't have much quarter sawn lumber and the end grain on your wood runs in different directions between each board? Say one board has more round rings on the end grain and another the end grain runs almost diagonal? How would you orient your end grain in that case? Or just scrap the end grain cutting board plan and make it edge grain?