Hi I bought my first stereo camera the other day, was in excellent condition except for the usual non functioning shutter. None of the easy tricks worked, ended up having to take it apart remove the lens elements ( which needed cleaning any way). What a pain to get working had many attempts at cleaning and lubing. Was really hard to get the right amount of oil. Too much and it wouldn't work too little and the same. I think the cooking spring is a little too weak for two shutters. Anyhow after nearly giving up I finally had it firing. Seems a little slow on the fast speeds, but I haven't tested properly to see.
The good thing is it comes apart pretty easily.
I added a small piece of shrink plastic on the cocking lever because the camera cooking mechanism wasn't quite pushing the lever all the way.
Hopefully it will work.