The Great Planes hinge cutting tool is one of the most useful tools ever made for RC. They now make a centering guide for marking the trailing edge as well as a cutting guide for the tool itself. With the different blades available for it, it will cut slots for all the hinges out there except the hinge points. Well worth the investment. Do not mess with the battery operated one as it does not have enough horsepower to do 6 slots before it needs to be recharged. Good Luck, Dave