When stacking cakes, one common issue bakers face is the appearance of unsightly holes or uneven surfaces on the top layer. This often happens when the cake support rods are not the right size, causing instability or damage to the cake layers. From my personal baking experience, selecting the correct rods can make a significant difference in the finished presentation of your cake. First, measure the diameter and height of your cake to match rods that provide solid support but fit snugly without creating gaps. Using too small rods creates holes by allowing the layers to shift and compress oddly. Conversely, rods that are too large may leave visible holes when the layers settle or shift during stacking. Another practical tip is to use multiple smaller rods evenly spaced instead of one central rod. This distributes the cake's weight more evenly and reduces pressure that causes holes. When inserting the rods, be gentle and precise, ensuring they penetrate straight and without forcing the cake layers. Additionally, reinforcing the cake’s structure by chilling the layers before stacking improves stability, meaning the rods won’t cause as much damage. I also recommend using dowels or plastic cake supports specifically designed for the cake’s size and number of layers. Overall, taking the time to select and install the correct cake rods can elevate your cake-stacking success, giving your creations a professional and polished look without the frustration of damaging your hard work.