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There are posts all over the net that says it can and does happen.
dont know what to tell you. They re-drill old holes, they drill connecting holes, drilled thousands of holes with nothing breaking...The cool thing about internet searches you can find exactly what you want every single time. On both sides of the coin.
That's one thing I've never seen is a broken blade on any auger. I've seen them dull and beat up chipped even....never busted/broken/snapped. I'd like to see one of these "broken/busted" blades. I've never seen one, and would like to know what the heck the hit when drilling to break a blade. I could see maybe even screw stripping out.......