I have a small tabletop 'bator that a friend built. The inside dimensions at the bottom are about 12x12, but after you take into account the water tray and gear there's about a 9x12 space for eggs. He has built a turner (a rolling platform, actually) that will hold about 9 eggs, but I think if I take that out and turn by hand I can fit about 15 in comfortably. Any suggestions as to what I should put in the bottom of the 'bator to rest the eggs on? It's just plywood and I worry about them rolling around too much or getting knocked about when clumsy old me goes to turn them. Thanks for your help!