Hi guys, I was using my Domino 500 the other day with the 5mm cutter. To my dismay all of a sudden I heard this grinding sound. I discovered that the bit had broken off about quarter of an inch from it's end and was floating around in the mortise hitting the remaining bit. Is this a weak point with this bit.... have this ever happened to any of you. If not, I suppose there could have been a flaw in the metal or if not... something with my technique? Maybe I was plunging too fast. It didn't seem like that was the case. I was using cherry, so the wood was not particularly hard. Thanks.