BFG866 Balance Cock Stud

[mikecj]

Everyone,

I am working on a BFG866 movement. I need to replace the staff due to a broken pivot. However, I can't figure out how to remove the stud holding the hairspring. Is it friction fit? There is no stud screw as with many movements. Thought I would ask before I go mucking about.

 

Thanks,

 

MikeCJ

[mikepilk]

"BFG" Big Friendly Giant ?  

Can you post a pic of the balance stud ?

[mikecj]

Please see the attached pics. Top view, bottom view, and close up of the stud.

[mikepilk]

Found it - Baumgartner Freres !  http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Baumgartner_866

Pin lever, one jewel, no shock protection - built down to a price !

Yes that looks like a friction fit. 

Cousins have quite a range of parts for this movement should you need any.

Good luck 

[Nucejoe]

 To push out the stud, secure the stud carrier arm in your staking set , also the arm can  be detached from the cock ,  or you can just unpin the hairspring.

Good luck

 

[Neverenoughwatches]

11 hours ago, mikepilk said:

"BFG" Big Friendly Giant ?  

Can you post a pic of the balance stud ?

Haha that always springs to my mind as well when i hear it.

11 hours ago, mikecj said:

Please see the attached pics. Top view, bottom view, and close up of the stud.

Looks like a pain to remove and worse to reassemble.  Any easier taking the arm off instead  ?

[watchweasol]

 Its a friction fit and pushes out,  or the alternative of un pinning. I always pushed out the stud carefully.

15 hours ago, mikepilk said:

Yes that looks like a friction fit.