Join Date: Jun 2011
Location: Decatur, Georgia
Bikes: Orbea Orca 2013, Cannondale R800 ('04), Bianchi Pista SS
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Just an addendum in case anyone else runs into this.
All the holes are now tapped and by all appearances, the manufacturer was just using a very worn tap M6 tap. Ours followed the thread but pulled out a good amount of additional material.
But, in the end, no worries. Just one of those quirks that might crop up when getting these off brand frames.