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HOW TO FIX A LOSE TENON
If your tenons loosen over time, or if you just cut the tenon
too small, you can either add glue and clamp like regular
chair tenon repair, or you can use a screw to spread the
tenon to fit tighter into the mortise.
To do this, simply drill a small hole into the post (from inside
the center of the mortise), and counter-sink the outside as
shown in the photo. Apply glue to the tenon and insert it into
the mortise as shown. This will expand the tenon and pull it
into the mortise. Glue a wood plug into to the hole you
countersunk on the outside of the post to hide the screw and
hole. Clamp together until glue dries. Sand down wood plug
if necessary.
