Only thing I can think of (is smaller than you describe, about 1cm long and 1-2mm wide) is the spring that sits on the upper side of the selector switch. It is on the left hand side of the mechbox, on the outside. Is an important spring, see if you can find it. If not, might not be much of a problem to post a wanted add on here to see if anyone has any spares. If not, might find a cut down spring form a Bic lighter (presses the flint into the striker wheel) might work as a replacement.
Best of luck!
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