74 Beetle Parking brake question?
 

Hi everyone,
My wife has a 74 beetle and after sitting in storage for 2 years, she finally decided to get it out. only problem is that the inside of the Parking Brake came apart.. The only part that I can find is a springon a rod with a hook at the end and the black thumb button.. I was looking at it the other day and can't seem to figure out how to keep the part inside once it is hooked.. Am I missing a part somewhere ?

Thanks in advance..