Here are some photos;
Closet photo 1 - top of jamb where the little ball strikes the plates and hold the door closed.
Closet photo 2 - top of door with threaded hole where spring drops down into it first, then ball, then threaded cap that holds it in place. Ball sticks up a little and catches the type of strike plate on header.
Please keep in mind that these are double swing doors. Not bi-pass or bi-fold but hinged swinging doors.
hope this helps - I really appreciate the help