public void setLock(ItemStack lock) {
if (lock != null && !isItemStackLock(lock))
throw new InvalidParameterException("lock is not an ItemStack of ItemLock.");
TileEntityReinforcedChest chest = getMainChest();
chest.lock = lock;
worldObj.markBlockForUpdate(chest.xCoord, chest.yCoord, chest.zCoord);
}
