On my webra, the high speed needle has a bolt in it so I can use a ball driver. I had the ball driver pop out, and my hand came pretty damn close to the prop. Since then, I just use the "standard" method that RCKen described. The biggest thing, is to slow down, and really focus on what you are doing. Most prop accidents happen when people are talking, frustrated (usually engine induced) or havent had a close call yet, and havent learned to truly respect that spinning meat saw on the front.