Grove provides a drill pattern plater for mounting the binding. This template
is based on the boot center marking on your ski.
In the case of a ski with a boot mid mark graph, like this...
Put a dowel under the ski and find its balance point. Mark a line across the ski. Center the rear holes (2nd set) of the front binding on this line. Center the template in the width of the ski. Clamp and drill. (use tape or a depth stop when drilling)