dd,you sure make life difficult for the rest of us
I had to leave my computer,grab a flashlite,get down on the floor,open the ash door,look in under the grates....
Of course the both ends on the grates are thicker..
If the grate was the same thickness from end to end,they would be able to slide around & go cockeyed & catty wampous in there.
They are perfectly fine designed like that,more beef is needed where they are connected to the camshaft & that area is not in the burn pot area & thus no ashes in that area either.