Place crock weight over cabbage; the weight should be submerged in the brine. Or, place an inverted dinner plate or glass pie plate over cabbage. The plate should be slightly smaller than the container opening, but large enough to cover most of the shredded cabbage mixture. Weigh down the plate with 2 or 3 sealed quart jars filled with water. If using a glass container with a lid, cover the opening loosely so any gas produced by the fermenting cabbage can escape. Alternately, you can cover the opening with a clean, heavy towel. If using a crock, seal according to manufacturer’s instructions.