Where to find a new mainspring for a Seiko 5740C

[rogart63]

Trying to repair a Seiko 5740C Lord Marvel. The end of the mainspring was broken. So it slipped when i wind it up. Found a generic spring on cousinsuk so i orded that? But when i open the barrel i found that the barrel arbor was smaller in diameter then the mainspring. So tried to make it smaller . But that didn't went so well? Broke it of course  . But then i measured the old mainspring. At that wasn't as long as the generic one. So now i am trying to find a original? But that seem to be very difficult? Any tips i can follow up? 

Or is there anything i can do with the to large diameter of the barrel arbor end of the generic mainspring? It's to much to bend it looks like? 

 

 

[clockboy]

Here

 

https://www.cousinsuk.com/category/seiko-movement-parts

[StuartBaker104]

Rogart,

I see original part here 

http://www.thewatchsite.com/8-seiko-citizen-trading-post/250138-f-s-seiko-lord-marvel-36-000-restore-set-nos-50-a.html

or here

http://stsupplyonline.com/catalog/5740c-main-spring-p-27145.html

or here

http://www.julesborel.com/s.nl/it.A/id.22222/.f

 

[rogart63]

1 hour ago, StuartBaker104 said:

Rogart,

I see original part here 

http://www.thewatchsite.com/8-seiko-citizen-trading-post/250138-f-s-seiko-lord-marvel-36-000-restore-set-nos-50-a.html

or here

http://stsupplyonline.com/catalog/5740c-main-spring-p-27145.html

or here

http://www.julesborel.com/s.nl/it.A/id.22222/.f

 

Try contacting the first guy there. STS supply is so expensive for me to ship from so i could just as well buy a donor watch

Jules borel i don't think i could buy from at all. 

So hope the Max answer my PM? 

[rogart63]

Or maybe i could buy from Jules borel? Tried and it seems to work? And the shipping cost wasn't that bad either? 

Thanks StuartBaker104

Edited April 14, 2017 by rogart63

[JerSievers]

This thread is a little old, but anyone have a line on a 5740C mainspring, preferably not a $60 NOS off eBay. Doesn't need to be seiko, if anyone knows a replacement.

 

[watchweasol]

Hi  Have you tried Jules Borel They have a database to look up parts by caliber, failing that Esslingers or Otto Frei all in the USA,.

[StuartBaker104]

According to this https://watchguy.co.uk/cgi-bin/mainsprings you need a GR4007D - should be available from Cousinsuk if you are this side of the pond