After servicing the movement, the watch had a low amp at around 150ยบ. On investigation I see an irregular bounce to the hairspring. So I thought I would take it off the balance and have a looksee. And this is what I find...
So instead of tightening a hairspring collet, we should use superglue instead!
Why, why why???
And yes, this watch was gaining like crazy too.
It's 6 o'clock, i'm tired - i'll fix it tomorrow (need beer).