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No experience with these sticks specifically but I'd say that wire you lost must be to connect that microswitch's ground wire to the other's ground/common wire. Why they used red I don't know, black or white are the typical ones. You can probably see the solder where the wire broke off on both ends, just solder it back on
ADD: And if not, some Hi-res pics of the solder side of the switches would help us get you on track
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