Springs for (Reverse Wind) Capitol Wind Music Boxes.
These were custom made to work with these machines. They measure approximately 15 inches long and approximately 7/8 inches in diameter. This is a listing for one (1) spring, more are available so contact me if you are interested in more). If you think you might need one, now is the time to buy. Once they are gone, they are gone. Any questions, feel free to ask!