Seiko 7009A Mainsping Winder Size

[Paul80]

Hi all

I am trying to repair a Seiko 7009A movement, what is the correct size Mainspring winder needed for this size watch movement.

I have one of the Chinese Winding kits bot nothing fits this spring, so was going to get the proper size Bergeon winder as I have quite a few of this movement to work on in the coming months.

Thanks for any input on this

Paul

[aac58]

I don't have a MS winder, I wish 

The best Bergeon size for a Seiko 7xxx is Nº 6, left handed, but I've read that it is a bit small (9,8 drum vs 10.5 barrel) But Nº 7 is too big.

[Paul80]

Thanks for the quick reply, will keep an eye out for a Number 6

On a good note and down to luck more than anything else I managed to get the Chinese 8200 one to wind the spring and successfully load it into the barrel, more luck than judgment I am sure, but at least its all back together and working.

Paul

[Nibbler]

Try to mix and match the winders with the winder insert. I had some success with this for the Chinese winders with 7009 mainsprings.  I finally gave up (as the Chinesium ones started wearing) and bought bergeon ones. The bergeon ones are quite a bit better for seiko. If you can get a new mainspring I would go that way.

Matt

[Birbdad]

On 8/4/2021 at 11:51 AM, Paul80 said:

Thanks for the quick reply, will keep an eye out for a Number 6

On a good note and down to luck more than anything else I managed to get the Chinese 8200 one to wind the spring and successfully load it into the barrel, more luck than judgment I am sure, but at least its all back together and working.

Paul

Hey out of curiosity did you ever pick up a number 6 or bergeon winders for this caliber? 
I'm about to order my first sizes for mainspring winders and i'm having trouble figuring out for sure whether the same combo of bergeon winder/barrel works for 7s26 and 700X.

These things are expensive so i want to make sure i get what i need and i'm just finding a lot of conflicting information.