7750 Plate Jewel to Small For Replacement Gear Pivota

[jdrichard]

Just got a new ratchet gear for a 7750 I am repairing and the end Pivot does not seem to fit into the existing jewel in the plate. Any advice?

Sent from my iPhone using Tapatalk

[Gasman]

Can I ask if the 7750 is genuine eta or an Asian copy? Some of the jeweling in the Asian versions is different than the Swiss.

If you have a jeweling kit the easiest option would be to carefully remove the Jewel so you can measure the outside dimension and then measure the pivot and order a new Jewel and refit. Will obviously then need to check and adjust the end shake.

[jdrichard]

Can I ask if the 7750 is genuine eta or an Asian copy? Some of the jeweling in the Asian versions is different than the Swiss.

If you have a jeweling kit the easiest option would be to carefully remove the Jewel so you can measure the outside dimension and then measure the pivot and order a new Jewel and refit. Will obviously then need to check and adjust the end shake.

Big issue is I don't have a Jeweling kit! That is a bigger investment that I may need to dive into. I guess there is no reaming out an existing jewel as the material would be too hard. I believe this is an Asian 7750.

Sent from my GT-N5110 using Tapatalk

[Rafal]

what about Jacot tool to change pivot size? thats standard procedure for balance staf pivots.

[oldhippy]

A jacot tool is for burnish pivots.

[Rafal]

and we cant burnish this one here to fit jewel hole? there is no image so I could misinterpret something

[jdrichard]

and we cant burnish this one here to fit jewel hole? there is no image so I could misinterpret something

Will provide the image when I get home tonight. But is is a simple round pivot with a flat top . Picked the part up from Cousins

Sent from my iPhone using Tapatalk

[Gasman]

Can I ask if you have a staking kit?

 

[jdrichard]

Can I ask if you have a staking kit?

 

Not yet. May need to acquire a combination staking jeweling kit for deeper lever repairs.

Sent from my iPhone using Tapatalk

[Gasman]

Shame, if careful a staking kit can be used to swap jewels at a pinch.

What happened to the original wheel and why is it being replaced? Is the pinion ok on the original wheel?

[Gasman]

The reason I ask is others have had similar problems and came up with this bodge!

https://www.replica-watch.info/vb/showthread.php/39205-7750-Reversing-wheel-and-ratchet-wheel-SOLVED!!!

[jdm]

13 hours ago, Gasman said:

Can I ask if the 7750 is genuine eta or an Asian copy? Some of the jeweling in the Asian versions is different than the Swiss.

Right on, this is the 2nd or 3rd posting in a short time where people assumes Asian copies can interchange parts with the original, and buy parts without prior research before purchase.

[anilv]

wow.. there's a forum for replica watches..!

Anil

 

[jdrichard]

Ok. Can I place the gear into a drumel tool and grind down the pivot? If so, what type file to use? Just need to take a small amount off the diameter of the wheel pivot

Sent from my iPhone using Tapatalk

[jdrichard]

Shame, if careful a staking kit can be used to swap jewels at a pinch.

What happened to the original wheel and why is it being replaced? Is the pinion ok on the original wheel?

I crushed the original wheel pivot when screwing down the plate. A mature mistake.

Sent from my iPhone using Tapatalk