Keeping It Round

I was working on cups yesterday and thought I would fill you in on a little tip to help keep the rims of small objects round. When I first began making cups, mugs, and small objects, those pieces would often warp when removed from the wheel and upon drying. To keep the pieces round, I threw an upside down conical shaped piece with a hefty rim which aided in keeping its shape very round. It looks like a funnel but with a flat bottom.  I bisque fired the piece and now insert it into the tops of my mugs and cups when they have had a little time to dry but are not quite leather hard. As a result, my cups and mugs dry with a perfectly round mouth.