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Is it possible to straighten this pivot?

Bill2024
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Bill2024 WRT Addict

Bill2024

Posted
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The pivot on this fourth wheel is bent and I was wondering if there is any way to straighten it?

Full disclosure - I think I did this taking it apart when I caught it on the movement holder when turning the movement over 😢 

The movement does run, and it is possible to fit the seconds hand, but I imagine this is going to create all kinds of friction in the movement.

The fourth wheel is not jewelled on this movement. 

IMG_0789.thumb.jpeg.57baa110a44f008a1a2fa07ea8d77dbc.jpeg

AndyGSi Distinguished Member

AndyGSi

Posted
Posted

First question would be could you get a replacement if it snapped?

Yes you should be able to straighten it but need to be careful.

I've found the best way is with a long piece of tube having a similar I/D to the O/D of the pivot.

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Bill2024 WRT Addict

Bill2024

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1 hour ago, AndyGSi said:

 

First question would be could you get a replacement if it snapped?

 

Probably - the movement is an old Oris 581 kif, so not rare or valuable, but I must say don’t see many of these on eBay. I see lots of other vintage oris calibres but I don’t know if any of the parts would be compatible.

Is it possible to look up which Oris movements might have a compatible fourth wheel anywhere?

1 hour ago, AndyGSi said:

Yes you should be able to straighten it but need to be careful.

I've found the best way is with a long piece of tube having a similar I/D to the O/D of the pivot.

Thanks I think it’s worth a try. Can you suggest what type of tube might be useful for doing this?  I thought about trying a pin vice but that seems a bit clumsy. 

Mark Distinguished Member

Mark

Posted
Posted

Its risky but sometimes do-able.

I showed a technique in one of my old videos...

Go to 0:46 (46 seconds in)..

Be very careful

Hope that helps.

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AndyGSi Distinguished Member

AndyGSi

Posted
Posted

They're available from Cousins but appear to be a one movement only part.

image.thumb.png.503c12e98b211f74a0defad6e151cdd0.png

I've got a selection of stainless steel tube.

You'll also need to support the other part of the shaft to make sure you're only bending the pinion.

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