The strength of round holes are amazingly strong. As long as the holes have a smooth radius w/polished off edges it should be fine. Cracks start in sharp corners and existing cracks. Fallen Arches: The Surprising Strength of Eggshells
"Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful!"
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Last edited by DelmarRey; 01-04-2012 at 07:49 PM.