I was just planning to make some plaster bats. Why did you make a double groove for the foot ring? In my mind I'm thinking a single groove. Could you please elaborate? Also, did you cut the rings with a loop tool? Thanks,
A double ring foot on a plate helps prevent sagging in the middle . . . which, on a large plate, would be less supported. Some potters also put a wad, perhaps with their chop mark or stamp, in the center of the plate to provide support against slumping during glaze firing.