So you weren't able to undo it with a pin spanner or similar tool?
no I finally figured it out. I even took the lens off. I then decided it was a moment to take a breath and think a out things haha before diving in! I decided to put a roll through it on sunny days and see a) whether I even like the thing b) am happy just using it as a sunny day camera (ie greater than f4 with 200 ISP film which seems to keep the shutter speed at the faster and still working speed).
I will get the back and then decide to go for it or not. If that is the case eurekaiv I may be bugging you haha