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Hi @ManSkirtBrew have a read of this tech document, it’s a bit of a mish mash English and Spanish , E870.pdf

On eco-drives, I've had to replace the battery, then pull the crown out and leave it like that for a few minuets, then push it back in and it start ups correctly.

Hello everybody, sorry for the late reply. Thank you all so much for your help and your tips. I got lucky and found a replacement wheel bridge for cheap which actually ended up being in decent condition. I decided not to do anything about the mainspring barrel pivot since I didn't have the right tools and the barrel didn't have much endshake anyhow. I am happy to report that the watch now runs great, I have regulated it to about +-10/s day which is fine by my standards. The timegrapher result looks decent as well, although beat error is around 0.6ms which could be better I suppose. Amplitude reaches over 230 quite consistently which I'm happy with also. My lighter fluid has also been replaced by balance spring cleaning solution and now the springs don't stick to themselves anymore - who would have thought. I'm super happy with this watch, it might not be worth a whole lot but it's awesome that I could restore it and it makes me wear it with pride. To me it's a genuinely good lucking watch, it'll be my daily driver for a while. Thanks again to everybody for their input! I couldn't have done the repair without your help. Here are some images for those interested, the bracelet isn't original but I don't really mind: