hifi engine

Need pictures of ITT 3001 Stereo Electronics


I opened my ITT 3001 electronics to clean it. When opening it a part fell out as if it was not attached, a cord with on both ends a spring attached. Now, I don't know where to put it, and I haven't found detailed enough pictures on the internet. Does anyone have the same receiver and could send me picture, or tell me what to do with that part.

Thanks in advance.
If you have the manuals they are welcome as well.