Replying to Boot with 316 mm to 315mm base

Long story short...got new boots and am adjusting my old bindings set up. One ski (nordica mach 3 superchargers) has a bindings system that goes by notches. The 316 is good and the little adjustment tab on the back of the binding is slightly behind where it should be...but the next notch up is to short so I figure its fine.

The other skis, have axial 2's on them setup for a 316 mm boot. My new one are 315. I honestly forgot how to adjust those things. I figure I could slide them up the 1mm or so to get the binding to read correctly.

Anyone know how to adjust axial 2?