I don't know what the 45 thing is either, but have made flying geese using Eleanor Burns method (did not turn out well) and then used Deb Tucker's WING CLIPPER. They turn out exact every time and are so easy! I would definitely advise buying the Wing Clipper from Deb Tucker's website (Studio 180 design). I have no affiliation with either quilter...just love all of the templates that I have purchased from Deb Tucker.