Mirror detached 680 camera

[AlexBiPolar]

Hello,
thanks for allowing me to be part of the Forum. I got a 680, which has a blank viewfinder. I figured out that the mirror inside has come loose. I can hear it rattling in there. I believe it is intact because when I tilt the camera up and make the mirror fall back in position, the image in the viewfinder is intact.
I need to reattach this mirror.
Can anyone help me please. I collect a lot of cameras (late 1800s and early 1900s) but this is my first Polaroid. And since all my cameras work, I want this one to work too.
However I'd rather do it myself if possible.
Look forward to hearing from you.
cheers