Depending upon which rod is involved-
Some are retained in plastic collar; once inserted, the collar is rotated and clips around the rod, holding it in place.
Others go together in a sequence. Item 9 I think is disconnected from the latching mech first (1&7), once the rod is dangling in the 'quadrant' item 29, the rod is turned through 90°, and simply slips out of the slot.
What you really need to do is show a pic of the problem bits, so that specific suggestions can be given.