replying to Jim Elbrecht, Jim wrote: As usual, I bought a $32 new door to replace an existing door, that had rounded hinges. So I want to use the hinges I have, being basically a cheap skate. I don't want to buy an expensive router to install three hinges. I saw where you can get something called a butt plate that you hit with a hammer to make the cuts, but they apparently only come for square cornered hinges. So I will use the advice above and hand cut the curved corners.