Pallet fork and balance not engaging properly

[m0g]

Hello,

 

So I have two Seiko movements which are non runners: 66A and 66B.

My goal is to get one of them running.

 

I have cleaned everything, and I am now in the process of reassembling. The train of wheels seems fine and spins freely.

 

The pallet fork has been mounted with its corresponding bridge and moves freely.

 

Upon installing the balance, I've noticed that it isn't engaging with the pallet fork, and I don't understand why.

 

So here is my question, why isn't the pallet fork moving?

 

Thanks

[hpekala]

Balance roller jewell is missing.


Sent from my iPhone using Tapatalk

[m0g]

I see, I dipped the balance in lighter fluid, so it must have fallen down somewhere.

Is it possible to fit it back in place?

[AshF]

They are normally held in by shellac.  IPA and other cleaning fluids can dissolve the shellac.  I've never had one dissolve in lighter fluid though.

[m0g]

Both movements are fairly old and in not such a great condition. I don't have the watch with me right now, but I think both impulse jewels are gone. So next time, I'll be a bit more careful with the lighter fluid.

Refitting a jewel might be too involving for a beginner like me. I will buy a NOS replacement balance.

Thanks