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From what I can figure Daval used two different type springs on their Trade Stimulators such as Reel 21, and placed them on every other reel stop...One is a one piece spring and the other is a two part spring riveted in the center to connect two shorter springs together. I need some of these as they seem to have had very rough lives...I have found a spring of the correct diameter but the wire itself is of a too heavy gauge causing the spring to be too stiff...I May be incorrect on how these were placed on the stops, but this is the best I can figure from looking at several machines...Can anyone help here....Did Daval ever publish a service maintenance guide? I appreciate your time and Thankyou Bob Reno in Fort Payne Alabama

Interesting;
apparently nobody has a good answer as of yet;
a quick check of what I believe are 5 original Daval Humpbacks (but who knows if the springs have been replaced);
1 had just 1 two-part spring, the rest were long springs.
1 had all two-part springs and no long springs.
3 had 2 two-part springs, but they were all next to each other, not alternated with the long springs.

Maybe Daval just installed whatever was available, but it's hard to imagine a company that big would have a shortage of the long springs and have to couple shorter springs together to complete machines.