I'm not exactly sure, but the curtain was dragging at slow speeds, then it was just kaput at fast ones too.
Before it started dragging, the advance lever would not return to its start position either, so I think it was a compound issue...
In order to make an exposure, I was advancing then clicking the shutter to make the photo, then bringing the advance lever back manually.
I tried adjusting the little screws under the bottom plate as indicated online, but that didn't do diddly!
In all honesty, life is too short to spend hours and hours trying to fix stuff that should just be left to professionals, or replaced.
I wanted it to work, I like the crazy thing...but for less than a good lunch, I can get another one...and then there's the fact that I have enough cameras that work well....you know it goes on and on....