Speak to SF . They may tell you why they should restore them.
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Given what I've seen about how they're constructed I'd say that taking them apart seems like a bad idea. They're very intricately constructed and it's doubtful that you'd be able to get them back together correctly. Sumiko, the US distributor might be able to help you out with getting them repaired, look them up on the web, I think they're in the Bay area. Good luck!