Removing the hairspring from a ETA 2846 balance

[evenflow]

How do I remove the hairspring from an ETA? 2846. Balance  staff pivot is broken and I need to transfer the spring over to a new wheel. But the spring stud is not removable. It seems it almost looks like a snap ring at the top of the balance cock or am I missing something?

[GPrideaux]

I can't answer your question, sorry, but you probably don't what to transfer the spring to a new wheel. Springs and wheels are paired ("vibrated" together) to get the right timing and transferring the spring to a new wheel is quite likely to see you minutes per day out with no way to correct it. Some may tell you to replace the balance staff, but if you're a beginner you're probably better off sourcing a replacement "balance complete" if you can: staff, roller, wheel and spring already assembled as a unit.

[Nucejoe]

   Link below shows the tool used to push the stud out. You can make the tool , just file a screwdriver to this shape. 

https://www.esslinger.com/bergeon-16918-etachron-stud-remover-screwdriver/

There are vids on YouTube showing how the stud is to be  push out.

Shouldn't get over creative, just go by this approach. 

Good luck.

[evenflow]

Thank you. Will check it out