Stick a fine wire into the open joint and see if you can feel
round dowels or a square tenon.
If it's dowels, open the joint as far as you can and saw thru
using a coping saw. Then drill out and install new dowels.
If it's a tenon and you have a metal detector, see if you can find
any nails or brads. A strong magnet may work too.
If no metal is found you may have a fox wedged tenon.
This chair has gotten wobbly enought that I don't think it is safe to sit
in, but I can't pull it apart to reglue it. I have put a fair amount of
force, but it will not budge anymore than shown in the photo. I am afraid
to force it, as I expect it will do some difficult to repair damage.
Any suggestions. Would working some glue in and clamping it do anything?
I assume it is held together by dowels, but do not actually know.