From Newel Post and Banister Tightening · Step 6 of 8 · Video by This Old House

Showing 2:13–2:31 of the source video.
Before permanently securing the newel post, it needs to be perfectly vertical or 'plumb'. Use a level to check its vertical alignment. Once it's plumb, use wooden shims inserted between the newel post and a temporary block (or the adjacent wall) to hold it in the correct position. The shims protect the finished surfaces while providing precise adjustment.
Goal: Position the newel post vertically and hold it steady for drilling.
This project provides step-by-step instructions on how to effectively tighten a loose newel post at the base of a staircase. The process involves plumbing the newel post, creating counter-sunk pockets, pre-drilling pilot holes, driving structural screws into the stair stringer for a secure connection, and then neatly plugging and painting the holes for a finished look.
If there are small gaps between the newel post and the floor/stringer, or between the banister and its supports, insert thin wood shims into these gaps. Apply wood glue to the shims before insertion for a more permanent bond. Trim any excess shim material flush with the surface.
This project involves identifying the cause of a wobbly newel post and loose banister and then applying appropriate methods to secure them. This may include tightening screws, reinforcing connections, or using wood shims and adhesive.
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