eta 2472 mainspring

[gary17]

hey

i have 4 eta 2472 movements from 4 different watches. One needed a new mainspring. so looked it up on cousins and they say mainspring is GR3271 so i ordered it from then. When it arrived it does not fit the mainspring barrel. So i have now tried it in the other 3 barrels and it don't fit in any

1.30 x .105 x 360 x 10.5 Automatic

GR3271X

thats from cousins page.

 

Mainspring / battery
Zf869, 1.30 x 9.5 x 0.105 x 300mm

So am i to assume cousins are wrong and ranfft correct?.

Has any one else come across this and if you have what mainspring did you use.

cheers

gary
 

[WatchMaker]

 Hi @gary17

The GR 3271X should becorrect for an ETA 2472 as the closest available GR mainspring.

You could do this to ease your mind / double check:

1. Cross reference to the 2472 parts list. If you do this you'll see dimensions of 1.33 x .105 x 333 specified. [These will be the ETA specifications and can be considered 'ideal' but it's about finding the closest GR match].

2. Measure one (or more) of the mainsprings you've removed from your 2472 barrels. Does it match these ETA dimensions / the 3271X dimensions (i.e. it may have been replaced before)?

3. Look at the GR tables (available on Cousins or elsewhere) to find the closest match to the ETA spec ... which you should find as the 3271X.

As a further cross reference look at the GR-to-calibre charts. They further confirm that an ETA 2472 should have a 3271X.

So now to the crunch...

12 hours ago, gary17 said:

i have now tried it in the other 3 barrels and it don't fit in any

... what do you mean by this? Can the spring not be coiled tight enough? Is it too high? etc.

Are you super-sure you're dealing with a 2472 (post a pic if necessary)?

Have you been sent the right spring?!

 

[rodabod]

I presume the reason it didn't fit is because it's a 360 length as opposed to 300? I would have expected you might be able to still squeeze that extra length in (ooh err!).

They indicate this corresponds to a 10.5mm barrel versus a 9.5mm barrel, so you can check that.

 

[gary17]

hey

cheers guys

gary

[JohnR725]

8 hours ago, WatchMaker said:

GR 3271X should becorrect for an ETA 2472 as the closest available GR mainspring.

it's what's recommended in the catalog I snipped out the page.

looking at another source of this link at the same mainspring it's unlikely not impossible that two sources would have the wrong part

http://cgi.julesborel.com/cgi-bin/matcgi2?ref=ETA_2472

I'm also attaching the parts list which is interesting is old enough watch that the mainspring originally came into pieces. So the parts list the height is 1.33  strength 0.105 and the length 333

can I assume that the problem is you're attempting to insert the mainspring in from the ring? It would probably be better if you use the mainspring winder if that's what the problem is, as the length isn't going to be an issue.

 

ETA_ETA 2472.pdf

[cor9brg]

Hi There

Anyone know which mainspring winder to be used for this spring type GR3271X? Thanks!