Parking brake issues

[forestb]

My parking brake return spring on my 62 c10 short bed keeps on slipping out of the hole. That is where the spring attaches to where the x frame comes together right under the drive shaft. does anyone have any recommendations for keeping it in place? I can get it to stay long enough to put everything back together but after about a half hour it slips out of the hole. Also does anyone have a picture? Maybe I am putting it together incorrectly. It is the type with the 2 big mettle bars that sit inside slots in the x part of the frame. It is not the type with all the cables that all the diagrams show.