Hello Randy,

Interesting photos. Have you tried to look at the half hole without mounting
it? Some of the artifacts are suspiciously similar is size ad shape to the
glass fibers near by. I noted what looked like it might be a small amount of
nailheading on one of the photos which might be an indicator of some drill
issues.

Fractured glass fiber ends from drilling dislocated during etchback and
redeposited perhaps? An elemental mapping in an SEM with EDX should tell the
tale.

Good hunting,
Joe

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