Great minds think alike! lol.... My version is this: I use a post it note that I keep in a drawer by my machines. It has 2 purposes, first I use it to slip over my throat plate so when I change the needle it won't slip down into my machine. The 2nd one is to mark which needle I have removed if it is still ok to use. I also made a Needle Saver pincushion for used needles that are still good. Unfortunately, that was before I began quilting! I have no place to put my quilting needles! lol