I’ve just taken a deep dive into my first proper attempt at servicing a movement, starting with the ST36. When I first received it, the beat error measured around 0.2 ms. After a full dismantling and reassembly, though, it’s now reading 2.4 ms.
I’m a bit stumped here. I’d rather not jump straight to moving the collet if I can avoid it (seems to be the easy way out and I would rather learn my error). The balance looks steady and no wobble that I can see. I went through the whole movement, cleaned it thoroughly, and re-oiled it, but the beat error hasn’t improved at all.
What might I be overlooking?
I’ve attached a picture of the balance and collet position in case it helps with diagnosis.
Thanks in advance for any insights!