I just bought my Strikemaster 4 stroke today. It works great! It came with a DVD however, so I watched it tonight after I got home. Dave Genz is on it, and said when drilling your holes, once you hit bottom of ice, shut it down and pull it back out not spinning. I have always pulled it back out spinning, kind of like drilling through metal or wood with a drill. There's footage on it of him drilling holes and he leaves it spinning when he pulls it back out. What does everyone else do? Just seems easier to me to leave her spinning.