You should never underestimate the value of the butt cap, as it can make a big difference on the global aspect of the rod. For example, if you have a one-piece rear grip in cork, you can simply add a corresponding butt cap, or you can choose a black rubber butt cap, which will give it a custom look. You can also pick a heavier butt cap if you have balance problems, or simply add some color to enhance the custom appearance.