I am trying to please a couple friends by making them each a 'knitting bowl' which seem to be popular in our area. However I am repeatedly having 2 problems with my bowls - warping during the slow drying and then sagging of the cut area during the glaze firing. I do my cutting of the design when not quite leather hard and the cut channels are thin, yet the remaining design seems to warp out a bit. (I have tried supporting the open channel and also drying slowly upside down to keep the top edge stable.) Then during the firing it sags so that the cut channel has a block in the channel. My thrown pieces are not overly thick or thin and I fire these to cone 10 in a gas kiln. Any ideas of what I should or should not do?
Perhaps if they were not such experienced knitters I could get away with giving them a less than perfect bowl - but that's not my style.