I have an older Sachs 7 with that clickbox, and I am afraid of it. My plan, for now, is to try to find a backup one from Ebay (or somewhere) to cover me when it goes belly up. Good luck, and please do let us know how your repair attempt goes. I will be interested.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever