Will Parrett wrote an answer about Look Pivot 14 Ski Binding on February 20, 2013
The binding length can be modified slightly, though it probably isn't recommended, by adjusting the forward pressure. The forward pressure adjustment is controlled by the two screws at the back of the heal (the screws are inside the black cylinders supporting the heal).
When people change boot sizes, they generally go down a size for a more aggressive fit. Before mounting the bindings, extend the forward pressure screws. This way, when you get a new boot you can tighten them down. There isn't much play in the binding. I was able to reduce a boot size without remounting (26.5 to 25.5). It won't adjust further anymore but they ski great. When adjusting bindings yourself, be careful not to over tighten the forward pressure so you don't affect the elastic travel of the binding. Doing so affect how the binding releases.
Overall, awesome binding and my first choice for the resort. Worst case you can generally remount a pair of skis twice without any issues. Remounting should have no affect on your decision to purchase the binding. You will be thrilled with the performance, which more than makes up for any inconvenience. BUY THIS BINDING.