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i got a new pair of boots a few days ago and i had my bindings mounted to my last pair of boots which were bigger, they are mounted at true center, now that i have my new ski boots that are smaller than my last ones would sliding the heel peice up to make the binding fit the boot make the ski forward mounted? or will it keep the ski mounted at true center? (used searchbar)
Unless you froze of half your foot and went from a 320 BSL to a 270 BSL, no. Just adjust the heelpiece, or let someone do it if you don't thrust yourself with it, and have a look at how many mm you have to adjust it, you'll see it's nothing
You'll be 1cm forward now if you've gone down 2 sizes. Ski them as they are and see if you notice a difference. If you do then have just the toe remounted 1cm back and you'll be centred, providing the original mount was done with the jig set for your boot.