Anyway, what's the problem with the seat back, the backspalt?
I am sure it came from another chair, used because it was more ornate. I think the original backsplat (maybe upholstered?) was removed, possibly sawn off at the back legs. I think that back seat section isn't original, swapped in to cover the tops of the sawn off back legs.
This left the back face of the back legs proud of the back rail, so the excess was sawn away weakening the mortice joint.
The replacement backsplat was glued and screwed, with two big screws, into the back rail.
Anyone who sat in the chair and leaned back would put a huge torque into the back rail.
This is what caused the mortice and tenon joints there to fail, along with the joints being already weaker.
So, what to do? What to do?
I don't know yet, but it won't be strong enough to lean back on.
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