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Tissot 784

Kappa505
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Kappa505 Member

Kappa505

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I am currently I'm the process of servicing a Tissot 784. The incabloc in the main plate for the balance was broken and subsequently led the previous owner to super glue the jewel in place. I thought I found a replacement balance jewel assembly with incabloc but when it arrived it seemed much too large. I measure it with calipers and the largest diameter is 2.15mm. I compared it with the one that I removed and that one only measured 1.9mm at it's largest diameter. I have attached a photo of the part I ordered. Any ideas on where I went wrong? Multiple ebay vendors have this part listed for multiple movements. 

PXL_20220712_200852194.MP.jpg

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watchweasol Distinguished Member

watchweasol

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Hi  I have attached three sheets in order for you to cross reference the number, a quick look indicates the number on the packet is correct but obviously does not fit. The fact that the old one was broken was this due to wear of hamfisted fitting by the previous attempt at repair, the cock you have may also not be origional.  a pocture of the movement front and back may help. Also have a look at the Ranfft web site for a comparison and further information.      cheers

2789_Tissot 781,782,783,784 (7).pdf 2790_Tissot 781.1,782.1,783.1,784.1 (10).pdf 2791_Tissot 783.2,784.2 (7).pdf

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Kappa505 Member

Kappa505

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1 hour ago, gbyleveldt said:

That’s the lower setting. The upper would be on the balance cock. I’ll go look for some pics of a recent service I did on one of these in the morning. Maybe it’ll help giving a little more detail

Do you know where I can buy this setting? I just need to replace either the shock spring or the entire setting with shock spring. 

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gbyleveldt WRT Addict

gbyleveldt

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1 hour ago, Kappa505 said:

Do you know where I can buy this setting? I just need to replace either the shock spring or the entire setting with shock spring. 

Not sure where you’d get the shock setting loose to be honest. I was lucky and got an escape wheel for that watch at Cousins, but because it’s a Swiss watch parts are generally a pain. Grsnovi’s suggestion might be a good one.

Is the whole setting damaged or is the spring just missing?

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anilv Distinguished Member

anilv

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My experience is the Incabloc on these Tissot seem to be a bit weaker that on others as I have personally encoutered around 4 or 5 of the Inca springs. I dont have any issues with Inca on other brands.

You can actually buy the springs itself instead of the whole setting.

Anilv

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Kappa505 Member

Kappa505

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10 hours ago, grsnovi said:

You might try these guys:

https://www.ofrei.com/page615.html

Since you know the make/model and jewel setting diameter, they seem to have quite a selection. They've been pretty good answering my questions but I've never gone to them looking for such a specific part.

Looks like shock spring 270.03 is a listed application for the tissot 784. Thanks for the tip! As far as the glue in the incabloc seat i will just have to be thorough in my cleaning and verify under the microscope.

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nickelsilver Distinguished Member

nickelsilver

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No help but maybe reassuring: had a fairly recent (20yo) Patek manual wind in a few months back with some oddball hole a cap setting superglued in as the Kif spring was broken. Guess they lost the original jewels too. Friend has a box full of envelopes of Kif material so managed to get it right.

 

Crazy thing is it ran. Very, very poorly,  but ran. That's why my client bought it, "ok it just needs a service!"- and a soak in acetone, haha.

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  • 3 weeks later...
Kappa505 Member

Kappa505

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On 7/12/2022 at 9:42 PM, grsnovi said:
On 7/12/2022 at 9:42 PM, grsnovi said:

You might try these guys:

https://www.ofrei.com/page615.html

Since you know the make/model and jewel setting diameter, they seem to have quite a selection. They've been pretty good answering my questions but I've never gone to them looking for such a specific part.

 

So my parts came in and I pressed in the new setting and now I have a running watch. Thanks for the lead on this. 

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