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 --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------