I tried that marked pin cushion method. That only told me what's in the pin cushion. I still didn't know what was actually in the machine. So I bought a craft organizer thingy at JoAnn's that's just the right size to hold machine needle packages. The orange button is what's in the Janome and the red button is for what's in the Pfaff. The red button compartment is empty because that whole package of needles is in the tool compartment on the Pfaff. But if I change it to a needle that's not out of that package I'll move the button.