Replying to Binding Help

I took out my old junker skis fror some backyard jibbing and urban rails. Since i am now much bigger, i need to adjust the length of the binding between toe and heel. The binding is the Salomon C608, its a junior binding, similar to the S710 which is an adult model. Does anyone know how to adjust them without remounting? Thanks. (Even if you are not familliar with the model or whatever, any tips are appreciated.)
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