ETA 2824-2 Stem Question

[systeman]

Hi all.

I'm servicing a EAT 2824-2 movement I bought of an auction website. There was no stem and I took a gamble.

While waiting for it to arrive I ordered a new generic stem, and assumed it should fit.

Taking the keyless works apart, I could see the remains of the original stem still in situ.

Comparing the original to the replacement, they are different across the flats. The original is 0.51mm. The replacement is 0.74mm and will not fit the sliding and winding pinion.

 

Does anyone know where I can source an original with 0.51mm across the flats?

[Tmuir]

Is everything else correct in size?

If so you could try filing down the square using a diamond file.

Fiddly but not impossible if all other measurements are correct.

[systeman]

I just took another look at the broken piece. The original stem had a helical square section.

 

[clockboy]

Cousins do two a generic and an original.

https://www.cousinsuk.com/category/filter/eta-esa-movement-parts

[rogart63]

Sure it's a 2824-2 . Think 2836 has helicoidal stem? Otherwise i think 2763 has a helicoidal stem. But don't know if it has 0,51. Think i could have one so i could measure. 

[systeman]

2 minutes ago, rogart63 said:

Sure it's a 2824-2 . Think 2836 has helicoidal stem? Otherwise i think 2763 has a helicoidal stem. But don't know if it has 0,51. Think i could have one so i could measure. 

Thanks,

Just looked at the movement, it's ETA 2824. Looks like it's Elabore spec and is off a Technos watch.

I think the measurement across the flats is supposed to be 0.50mm.

[Fred]

Are you sure it's 2824-2?

Im quite sure the stems are different from the 2824-1.

[rogart63]

The stem for the 2824 is helicoil square. But i think you bought a 2824-2 stem? 

So you need a 2824 stem . My mistake there also.  It's not a 2824-2  it's only  2824 . 

 

Edited June 19, 2018 by rogart63

[systeman]

39 minutes ago, rogart63 said:

The stem for the 2824 is helicoil square. But i think you bought a 2824-2 stem? 

So you need a 2824 stem . My mistake there also.  It's not a 2824-2  it's only  2824 . 

 

My mistake. It is indeed a 2824. So I'm after a 2824 helicoil stem.

[rogart63]

1 hour ago, systeman said:

My mistake. It is indeed a 2824. So I'm after a 2824 helicoil stem.

Think cousinsuk have that. If not windingstems.com have. 

[teegee]

Lol!

I remember replacing one of these some time ago with a square one that I had to file down in the lathe. I thought some gorilla had twisted it, and remember being puzzled that no teeth in the setting path were destroyed. Good thing this is one of my own watches! I still have the old stem, so it goes back on the todo list  

I'd never heard of a helical stem until you mentioned it!  What could be the purpose of it? Perhaps to increase pressure on the setting wheel, when setting the hand? Doesn't seem worth the more difficult production process. I'm assuming the sliding pinion is also helical?

(Sorry, kinda off-topic)

[GleaveandCoLuke]

The twisted stem for ETA 2824 ( not ETA 2824-2 ) is obsolete and very hard to find.  We sold out many years ago.  A simple and cheap solution is to change the stem, winding pinion and clutch wheel, all to the 2824-2 parts. 

[systeman]

59 minutes ago, GleaveandCoLuke said:

The twisted stem for ETA 2824 ( not ETA 2824-2 ) is obsolete and very hard to find.  We sold out many years ago.  A simple and cheap solution is to change the stem, winding pinion and clutch wheel, all to the 2824-2 parts. 

Thanks for the tip.

[jdm]

ETA helical stem discussion below

 

[systeman]

On ‎20‎/‎06‎/‎2018 at 8:31 AM, GleaveandCoLuke said:

The twisted stem for ETA 2824 ( not ETA 2824-2 ) is obsolete and very hard to find.  We sold out many years ago.  A simple and cheap solution is to change the stem, winding pinion and clutch wheel, all to the 2824-2 parts. 

I managed to source one:-

51.010.51 specified for the following

ETA 2802 2804 2806 2824 2826 2828 2830 2834

It'll be interesting to see if it fits.