This generally works OK, but for heavy duty use I find it is vastly improved if you glue it to an equal-sized piece of CD plywood. It makes it significantly hea

This generally works OK, but for heavy duty use I find it is vastly improved if you glue it to an equal-sized piece of CD plywood. It makes it significantly heavier, but it won't warp and it will write way better. Only adds a little bit to the cost (plywood + bottle of liquid nails).