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Mounting at -1(or whatever the guy a few posts up said) means that you would be driving the core center of the ski a little bit more with the ball of your foot. On normal sidecut skis, core center isn't usually directly under boot center, it's ahead of it a bit. Mounting these a little back will change how they ski, but if he drives his skis hard it could be in a positive way... Doing this would be smarter than mounting a normal sidecut ski forward recommended(because this has some advantage even for carving), which most of this site seems to do with park skis(Pipe Cleaners and Chronics mounted center for a good example of stupidity). I think it depends on how you ski, and what your skiing.
09(?) Reno Jibs had two marks: center and -1, for mounting..