To adjust the neck angle I used strips of sandpaper pulled under the neck joint. As the sandpaper is drawn through the joint it is has minimal contact with the upper part of the joint and the greatest amount of contact with the heel where it removes the greatest amount of wood. The neck gradually tilts backward as more wood is removed. It is imortant that an equal amount is removed from both sides so the neck tilts straight back. This method is slow but it is very controlled.
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