How do I make a vertical hairspring bend ?

[mikepilk]

Now I've got the stud glued on, I found that the hairspring near it is not flat, but bent upwards from a particular point. So it's not caused by a twist.

See pics (It's hard to photograph as the light wants to reflect exactly at that point !).

The question is, how do you make a vertical bend - as you would when making an overcoil, without having special tweezers? 

(I could live with it, but I'm getting 8s difference DU/DD)

[watchweasol]

Hi Mike  As you probably know already to make overcoils needs specisl tweezers. But I did see an article on the Tube with Henry B Fried showing how to adjust bent springs. He made it look easy just using normal tweezers.  Naturaly enough I cant find the articl now.  I think De Carle also covered it in his book.  good luck.

[Kalanag]

I like this video. But it doesn‘t cover bends that are not caused by a twist.

 

Edited June 13, 2022 by Kalanag

[mikepilk]

The bend is about where the regulator boot would be. So I guess someone tried to lift the balance out of the movement and it stuck, maybe under the centre wheel, and the spring stretched causing the bend.

[praezis]

One of the best and most easy methods is a strong, at the tip sharpened tweezers and soft wood. It also works with tweezers without that step, just grip the blade strong enough.

You will have more control on the result with slight hammer taps instead of just pushing.

Frank

 

(A typical drawing of great Jendritzki)

...and in an earlier copy of the same book I found a picture that directly adresses the issue of the bent blade:

Edited June 14, 2022 by praezis

[mikepilk]

4 hours ago, praezis said:

One of the best and most easy methods is a strong, at the tip sharpened tweezers and soft wood. It also works with tweezers without that step, just grip the blade strong enough.

You will have more control on the result with slight hammer taps instead of just pushing.

Frank

Thanks Frank, that method works really well. Another useful technique to remember 

[praezis]

Glad I could help, as always.

Frank