Tissot 7842

[Hasnain]

Hi 

I have a tissot cal 7842 with a hairspring totally out of shape . im not so sure how this hairspring detaches from the balance ,any advice would be much appreciated 

[watchweasol]

Hi   I have attached the tech sheets  for the tissot models  as there seems to be a lot of parts which are common across the range.  The balance complete is 720 without spring and 721 with spring attached, so by the fact it is supplied as a spare it is detachable.  the spring its self does not look too bad and most probably be re curved ok.  If you could supply a picture of the balance and cock laid upside down so members can see the attachment it would be a great help.       cheers

2790_Tissot 781.1,782.1,783.1,784.1 (4).pdf 2789_Tissot 781,782,783,784 (2).pdf 2791_Tissot 783.2,784.2 (1).pdf

[Nucejoe]

 W W is right, if you show a picture of the cock laid upside down, we have a chance to figure out how to detach the HS and if the collet is removable then sorting the HS out and shaping an end curve isn't a tough task. 

A top view with balance pivot inside the jewel hole, would be helpful.

 

[Hasnain]

3 hours ago, watchweasol said:

Hi   I have attached the tech sheets  for the tissot models  as there seems to be a lot of parts which are common across the range.  The balance complete is 720 without spring and 721 with spring attached, so by the fact it is supplied as a spare it is detachable.  the spring its self does not look too bad and most probably be re curved ok.  If you could supply a picture of the balance and cock laid upside down so members can see the attachment it would be a great help.       cheers

2790_Tissot 781.1,782.1,783.1,784.1 (4).pdf 2.84 MB · 0 downloads 2789_Tissot 781,782,783,784 (2).pdf 4.14 MB · 0 downloads 2791_Tissot 783.2,784.2 (1).pdf 1.26 MB · 0 downloads

Thanks for the response heres an image