Four FL installs - absolutely the easiest, most effortless, smoothest, fastest and best of all - safest way to complete this task. I'm not a business, this is my hobby, the 'fastest' part hardly matters, I liked the safety factor best. The 'product information' is spot-on, once you have crossed the Rubicon there is no going back to any other method. The tool itself is of NASA, Brough-Superior, Swiss-watch quality and performs with exactness, uniformity and surgical precision; 'correct' & 'proper' as the restoration people like to say. They aren't bashful with the price but when you slip or get hurt using another method you'll learn "what you save on the roast beef, you spend on the mashed potatoes." Well worth the price and happy customer here. Thanks again!