I did this! Got a frankin watch from eBay for £12 and took it apart and rebuilt it! Solidified my confidence.
I would never do it to an “expensive watch” but for most of my watches (around the £100 mark) I don’t really trust the water resistance anyway. So I tinker with the speed as they are known for not being the most reliable or accurate movements 😂
It’s just an iPhone app, so it’s reading -3spd
But this combined with the app twelve I’ve been tracking it’s error and adjusting the spd based on what the twelve app is giving me :)
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