When your chair seat screw holes are no longer working, you can put in Golf Tees in them and glue them in there. it will hold quite a while, and after they don’t hold any longer, you can drill an new hole! With golf tees it is easy to fix stripped holes.

Watch this if you like:
How To Repair Stripped Door Hinge Holes. Fix stripped wood screw holes.
The Cabinet Fix – Fix wobbly cabinet doors with a golf tee!
FIXING HINGES WITH A GOLF TEE