Add masking tape to the interior faces of the newel posts where they meet the handrails and to the top of the handrails, themselves, and mark the center of each. In our project, there are two handrails and three newel posts -- the corner post is shared by both handrails, so it will need tape on two adjacent sides.
Align the center marks for the newel posts and handrails on the tape (after temporarily installing a couple of balusters to support the handrail at the correct elevation), and then trace the shape of the handrail on the tape on the newel post. Remember, you will perform this step once on the newel post at the top of the stairs and twice on the corner newel post where the railing forms an L-shaped turn.
