The bats with a hole seems working. I have left a platter all day like this, but the rim is not lifting up. I covered the platter with a plastic overnight, and continue tomorrow. I made a throwing bats with a hole part, and threw one yesterday so see if warp. It stayed flat. This is 1/4″ MDF. If I can use it as the bats, I will make small bats out of the leftover 2’x2′.
I threw yunomi (green tea cup) and sake cups off the hump. I don’t know why I make them off the hump, while the most others off the bats. My habits,I guess.