I use a magnetic needle holder/organizer that has a clear vinyl sheet that flaps down on top to cover the needles. I don't have it handy at the moment so cannot say who made it but it has spots for different size needles and spots that you can label yourself. It also has a little magnet that you use to put in the spot that you take a needle out of so you know which needle is in the machine. Works pretty good for me. A friend just took a tomato pin cushion and wrote needle numbers in the different sections for her needles. All that being said, I like CD's solution but only if you have the room for all those machines!