How do you remove the hairspring from the balance cock on NH36 movement?

[jolax]

How do you remove the hairspring from the balance cock on the NH36 movement? Do you need a special tool disconnect that two parts that is connected to the index and regulator? (circled in red). I could not find a video on youtube that show how to disassemble and assemble this particular hairspring. Any help would be appreciated.

Edited May 19, 2021 by jolax

[Nucejoe]

Is the hairspring laser welded to the stud?   modern balance completes mostly are, in which case just punch the stud out of the hole.

Generally vintage watches just glued the H/S to the stud, some pinned.

 

 

[jolax]

That I am not sure, since I am still a new to watch repair. I am just trying to play around with the part to gain experience handling tiny watch movement part. I am thinking of replacing the balance wheel but unfortunately there is none that comes as a full assembly with the balance cock unless I buy the whole NH36 movement and remove just the whole balance cock assembly. 

[jolax]

I don't think the hairspring is welded, since sofly sells only the hairspring for this movement.

[jdm]

9 hours ago, jolax said:

How do you remove the hairspring from the balance cock on the NH36 movement?

Check topic below - it's always useful to do searches here.

The most difficult part for a beginner dealing with an Etachron stud is reattaching it, that is also discussed in more than one topic. Attached service manual which has illustrated specific instructions.

Seiko 7S36C - Technical Guide.pdf

[jolax]

Thanks, JDM for the reply. This is what I was looking for.