.... OR, you can buy your favorite flavor of "Pringles Potato Chips" a tall Iced Tea and a good movie. When you're done, cut the pringle can in half and pop your large spool of thread in one of the halves. Set the can in the back of your machine and thread it as usual. If you save the top of the pringle can, you can have a spare container for pens, pencils, or another cone of thread. I've been doing this for years, wrapped in contact paper they make really cute containers for assorted notions in the sewing rooms.
good luck