Rear seatback release knob broken; how to fix?

[bulwnkl]

So, one of the two knobs that release my rear seat back cushion to fold down is broken. This is on an '05 Baja, but I'm hoping this mechanism is common to the Legacy so that folks will know how to repair it. The passenger side knob still works, fortunately! But, I'd really like to get it fixed because you never know when the other one will break.

 

Anyone know how to fix it? Pics would sure be great, but even just text and a little Q&A support here should get me through. Thanks!