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countersink and re-tap
Having made and been party to the making of oodles of these dropouts...I recommend:
45 degree countersink to the outside surface for about 0.020"
Fresh M10x1 tap running from the inside to the outside, and a good one.
Be sure to apply abusive sideways force to the tap once it has protruded through the thickness of the hanger.
Ti is somewhat tough to tap, and it's only in the later years that the operators creating the dropouts cared enough to make the threads work, and sometimes the taps supplied to secondary QC operators are equally secondary in quality.
This isn't the first time, won't be the last, but the fix is fairly simple.
Drilling a 9mm tap hole with a 9mm drill in titanium isn't as assured a procedure as one might imagine.
The 9.1mm drill was prohibitively expensive. So was interpolating the hole with a 0.25" end mill, though the result was sweet.
The later frames did a better job of this, I promise. Better tight than loose.
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