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the lines can be over a cm off from one ski to the other, so measure before mounting. I think that the "here" line is supposed to be center of the running surface...so that should be good but it's a bit hard to measure since the base is a bit convex or whatever(put yours base to base, and look at the last point of contact, which at least on my pair is on the center of the base while the edges/outside of the base doesn't touch(barely, but on both skis)). I think that center of the running surface is about 1.5 back from true. It seems like everybody loves them mounted anywhere from center to -4, though..