About 8 years ago I replaced 13 interior hard core doors in the house. I had to do around 36 motives for the hinges. I found the Hinge Mate jig made the job very easy.
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Made of a good quality aluminum, it proved to be very accurate and easy to setup for variable sizes of mortices.
Not sure of your location, but you are welcome to borrow mine at any time. (I am in Cary.)
Wayne