This series of photos demonstrate how to replace a guide latch that is used on the Ampex Mark 10 and Mark 15 Quad video head assemblies.
      Occasionally a latch will  become disconnected and will need to be put back into it's correct operating position.
       This minor problem would happen often back in the day with new and inexperienced operators forgetting to use the latch release lever when closing the vacuum guide after cleaning the head tips.

<<<mouse over and click on photo for full size view.