I corrected the width guide stickers on my Lucy Clay Machine because they weren’t as straightly aligned with the metal housing as I like.
First, I very carefully peeled them off and stuck a 1/4″ strip of non-stick paper underneath the zero end–just enough to allow me to slide the stickers under the metal housing without them sticking. (For non-stick paper I used the slick paper that Con-Tact paper comes on.)
After I set the rollers so they touched, I slid the stickers back under the metal housing until the housing’s metal edge lined up perfectly with zero on the stickers and I re-adhered them.
I left the non-stick paper as it seemed too difficult to pull out without messing up the sticker.