Bulova 10ak/csh center hack how it works

[brunomartins]

Hi!

I am working on this movement Bulova 10AK CSH (center sweep hack I believe) but couldn’t realize how the hack system works. I am convinced the thin metal linked to the extended center pivot is the key but it doesn’t have a move part.

 

[Kalanag]

What you think of being a hack lever is just a spring providing friction to the central seconds pivot. It prevents the seconds hand from moving erraticly.

Edited September 23, 2022 by Kalanag

[brunomartins]

1 hour ago, Kalanag said:

What you think of being a hack lever is just a spring providing friction to the central seconds pivot. It prevents the seconds hand from moving erraticly.

Thank you! Well I’ll keep looking for thre hacking lever

[GuyMontag]

This is the hacking lever on the 10AK.

 

[brunomartins]

5 hours ago, GuyMontag said:

This is the hacking lever on the 10AK.

 

Perfect, I just noticed the hack lever this afternoon. Thank you! Now I need to get a new balance staff to finish the project

Edited September 23, 2022 by brunomartins

[Ant22]

I need a Bulova 10 AK/CSH central seconds stem. Can you help me ?