• I checked ebay and there aren't any 6770 rear derailleurs for sale right now. Are ones that are working a rarity?

    Yes. Hen's teeth with a side order of rocking horse shit doesn't come close. You can use the levers with more modern kit, and the cables, but the FD is a paperweight.

  • In the past I've picked up 6870 mechs pretty cheaply off eBay. No idea what the going rates are like now in the new normal though.

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