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I wouldn't have any problems doing this, for the most part. probably depends on the bike though, and you may not be able to do it fully internal. for example: pop the rivets out of a cable guide and use that hole, enlarge if needed. then maybe enlarge the hole from the (no longer needed) cable guide under the BB and route RD wire along the drive side chain stay.
I actually was under the impression that it was a fairly common thing for shops to do for you.
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