Even though the tool is a bit spendy, it is worth its weight in gold considering all of the frustration and hair pulling you will do without it. This esoteric product was specifically made for internal installation of Campy EPS V2 Power Units. The tool makes the job much more manageable and allows you to mount the battery in either direction to help with proper cable routing. As with all Campagnolo tools, the construction is top notch and even has that familiar satin finish.