A couple recent threads (John How's Fulmar build and one regarding some new Lee Valley chisels) have put me in mind of a question. When notching plywood to accept stringers or ribbands, what method do forum members use to make the square cut parallel to the outside of the mold or frame. The two perpendicular cuts are easily accomplished with a jigsaw or even a skilsaw. I have either drilled holes inside the cutout, then come back with a coping saw to complete the parallel cut, or brought the jigsaw in a curve to remove most of the notch waste and then cleaned up with a coping saw. Is there a better or easier method?
On solid wood, this would be achieved with good chisels which is why the other threads put me in mind of this question.