Proper procedure to replace broken balance for Langendorf 10118 movement

[stm]

I have a Langendorf 10118 movement where the balance staff was broken. I was able to find a new complete balance on Ebay, and now I wonder how I should replace the broken balance.

This is the old broken balance. If I understand it correctly the metal part in the red circle where the hairspring is attached is called a "stud". I have pulled out the small bolt below to remove the hairspring:

This is the base plate of the balance with the stud:

The new  balance also came with a stud:

As the balance comes with a new stud, I assume that the proper procedure would be to remove the old stud and to attach the new balance with the new stud to the base place. But I guess that would require a staking tool that I don't have yet.

It should be possible to remove the new stud in order to attach the new hairspring with the small bolt to the old stud. Am I correct to assume that this is a risky approach, because it would be difficult to attach the new hairspring in the right position, and the hairspring could be easily damaged?

Thanks

Stephan

[AndyGSi]

You can use the original stud carrier but will more than likely need to rotate the collet to align the jewel and set the beat error.

[RichardHarris123]

34 minutes ago, AndyGSi said:

You can use the original stud carrier but will more than likely need to rotate the collet to align the jewel and set the beat error.

Do you mean the new stud carrier? 

[AndyGSi]

25 minutes ago, RichardHarris123 said:

Do you mean the new stud carrier? 

If there's nothing wrong with the stud carrier already on the cock then I just use that.

[Nucejoe]

2 hours ago, stm said:

As the balance comes with a new stud, I assume that the proper procedure would be to remove the old stud and to attach the new balance with the new stud to the base place. But I guess that would require a staking tool that I don't have yet.

 No staking set is required. 

You can  pull the old stud out with a long nose plier.  

To refit the new stud, put the cock  upside down on any anvil, get the new stud in the hole and press it home with any tool you have most control using.  Tighten stud screw, done.

Do not unpin the hairspring from the stud.  

Tampering with new balance complete is big   No no.

No unpining.

No turning the collet.

No turning the roller table. 

Regs

 

 

 

Edited March 25 by Nucejoe

[AndyGSi]

15 minutes ago, Nucejoe said:

Tighten stud screw, done.

There is no stud screw.

[Nucejoe]

9 minutes ago, AndyGSi said:

There is no stud screw.

So the pin is friction fitted. 

Less parts to fiddle with. 

 

Edited March 24 by Nucejoe

[nevenbekriev]

Yes, the best way is to remove the old stud from the cock and fit the new one. But this will be possible if the pin size is the same for the new stud. Hope that this is the case.If no, then the old stud will have to be used.

No staking set is needed. Suitable tool for old stud removing is ... a nail clipper. Just pull while rotating it. Placing the new balance is while cock upside down on the table. Put balance on it, align it as the stud is above the hole and press on stud so pin enters the hole. Then rotate the stud as to align the terminal curve to seat correctly in the regulator pin loop. In this particular case, the spring mist be firmly touched to the pin and stay touched to it while balance oscillates.

[stm]

Do I understand it correctly that the base plate with the old stud is the "cock" (sorry, I'm not a native English speaker)? So this is the cock from the other side, and one can see that the stud is friction fitted:

I will carefully try to remove the stud from the cock as advised with my available tools. If that is not possible easily, I will try to attach the new hairspring to the old stud after removing the new stud.

[AndyGSi]

Yes that's the balance cock.

Before removing the old stud it's worth comparing the size of the stud on your new balance.

[nevenbekriev]

52 minutes ago, stm said:

Do I understand it correctly that the base plate with the old stud is the "cock" (sorry, I'm not a native English speaker)? So this is the cock from the other side, and one can see that the stud is friction fitted:

I will carefully try to remove the stud from the cock as advised with my available tools. If that is not possible easily, I will try to attach the new hairspring to the old stud after removing the new stud.

Yes, this is the balance cock. Base plate is the base of the movement. The down side pivots of the parts have bearing holes in the base plate. The up side pivots have bearing holes in cocks or bridges. Cock will have only one screw that fixes it to the base plate. Bridge will have 2 or more screws.

The most of advices  in the thread are  given as it is lever movement, but it is not. There is no impulse jewel here and no roller table. So, please ignore this words, no point to try to relate them to You movement. The correct zero position of the balance is when the mouth of the cylinder is pointed straight against the bearing of the escape wheel. But for now, just attach the balance to the cock and try what will happen, may be it will be 'in beat'. If not, then we will figure how to get it right.