Most balusters are fixed to the handrail with nails, hammered in at an angle to go through the baluster and into the underside of the rail.
When a nail is loose the baluster feels freer. Pull out the nail with pincers, replacing it with a longer and thicker nail. If you can’t remove the nail, hammer in a new one next to it.
Fillets of timber are also used between balusters to hold them in place. The balusters sit in a groove in the underside of the handrail and the fillets fill the gaps between each one. If a fillet drops out, nail it back in position or use a replacement that’s cut to fit. Don’t use adhesive, in case you need to remove the balusters later.
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