GREAT TIP !!! I always used a HERA marker by Clover which puts an indentation that is easy to see when you start machine quilting, The most important thing with any marking is you want to keep referring to your orginal center line to make sure you stay consistent with that line. It is so easy to slowly merge off that line and then discover that your lines are no longer accurate and trust me, it WILL SHOW !!! :lol: