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Hello and welcome to the forum,    In the Uk Cousins UK watch parts, A.G Thomas. Gleave and co  H.S.Walsh  all material houses   In the YSA  Jules Borel.  Esslingers   Time savers to name but a few.

BTW It is considered polite to give an introduction when joining the forum.    cheers. 

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Posted
On 5/2/2021 at 10:31 AM, MattS said:

Hi, can someone please guide where I can buy mainsprings for Seiko 6R15C/D and Miyota 8203. Thanks.

Seiko does not sell the mainspring alone, only the barrel complete. On the 6R15 the mainspring  made of a special steel (SPRON) and even if the barrel complete is  found, price may be quite high. On the other hand a generic mainspring likely will not provide the specifications of 50hrs power reserve.

That being said I don't know how you have diagnosed that something is wrong with the mainspring, which is not common at all. 

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Posted

Thanks for the replies. Actually there is nothing wrong with the mainspring that I know of, but since I don't have a mainspring winder I thought that it's not ideal to wind the mainspring by hand and would be better of to buy a new one.

Posted
1 hour ago, MattS said:

Actually there is nothing wrong with the mainspring that I know of, but since I don't have a mainspring winder I thought that it's not ideal to wind the mainspring by hand and would be better of to buy a new one.

Best is to not open these Seiko barrels at all, also because there is no known commercially available winder that fits perfectly. If you have pulled the mainspring be careful to not bend it and it may go back and work just fine.

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