I'm getting a used Juki LU-563 delivered next week and I want to order needles in advance for use with leather. Just want to be sure I understand: The main difference between 135x17 needles (which is what the Juki LU-563 manual says to use) and 135x16 is simply the point? So I should actually be ordering 135x16 needles for leather? I'm trying to avoid ordering the wrong kind of needle and having to return it. I have downloaded the leather needle point reference guides linked above; very helpful!