I have a pinball machine that needs a specific spring, but the usual sources have to custom make them, resorting to a minimum quantity (usually > 500). The spring is of compression-type. It is much fatter in the middle than on the ends. It looks like 2 cone springs back to back, but there are no welds evident, it is one whole spring. When compressed it forms a nice thin ring (all the coil turns come together). Anyone know - What kind of spring is this? Any known off the shelf source ?
Thanks in advance. Marcel