From what I can find the recomended hole size for a large egg is 21 inches. How much space is there between the egg and the hole? I was considering making my table's hole 22 inches and putting about 4 spacers (that heat won't effect) spaced around the inside of the hole to stablize the egg when rolling it around. Is it necessary or worth the trouble. If I do this, what you be good to make the spacers out of?