There are two different types of stairs----cut stringers---with the treads and risers nailed and glued--
and inset stringers ---where the 'skirt board' is routed out and the treads and risers are slipped into the skirt and wedged from underneath.
Before anyone can offer useable help--we need to know what you have.
Give us a better description----pictures will help----if the underside of the stair case is open--tell us what you see----
and inset stringers ---where the 'skirt board' is routed out and the treads and risers are slipped into the skirt and wedged from underneath.
Before anyone can offer useable help--we need to know what you have.
Give us a better description----pictures will help----if the underside of the stair case is open--tell us what you see----