What you really need to make the job easier is a “third hand” to align and hold the door in place while you attach the hinge to the face frame. So that’s exactly what I built: A support beam that clamps to the cabinet face frame and holds the door in position. Of course, not every cabinet door is installed the same way. So I added a studded knob to make it adjustable. You just turn the bolt to fine-tune the position of the door in the cabinet opening.
As you can see, this door mounting aid isn’t too complicated. It consists of two wood arms that are parallel to one another and offset just a bit. They’re connected by a spacer. By clamping one arm to the cabinet bottom, you can use the other arm to support the door as you align it against the cabinet face frame.
