Replying to How do i adjust the heelpiece on my Pivot 12's?

alright so i have Look PIVOT 12's on my anthems and bacons and i will be getting new boots tomorrow.  they measure like 4mm longer shellwise than my other boots so i wanna know how to adjust the heelpieces back to accomodate the new boots.  any help? i know how to do forward pressure, function test etc, i just dont konw how to move them back.

and please dont tell me just to bring them to a shop because i work at one and just would rather do it myself real quick, adjust to make sure they release fine and call it good.

thanks.