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Posted

Hello all,

A family member has a Tissot Bridgeport watch (Valjoux 7750 movement) that had stopped working, and, despite never taking a watch apart before, I decided to have a go at fixing it. Over the past few months, I've disassembled the watch (the problem was a loose screw, and another part that had come loose that stopped the chronograph reset from working) and I'm now ready to put it back together. Seeing as I've gone to all the trouble to disassemble it, it seems a shame if I don't take this opportunity to lubricate the parts. The ETA website has a very good step by step guide on how to disassemble and reassemble the movement (http://www.eta.ch/swisslab/7750/7750.html), including oiling points. I've had a search for those oils online, but if I were to buy them, it would cost around about £150-£200! I struggled to find the same oils on eBay. Seeing as this is a "one-off" thing I'm doing, does this community have any suggestions as to how I can just what I need to get by to do complete this repair project?

Thanks,

Amr

  • Like 1
Posted (edited)

All the lubricants from Cousins would cost like 50 pounds, you would have then approx 3 times for proper tool, jury-rigging it's not a good idea in watchmaking.

For further saving you could try asking a friendly watchmaker, or resell them after use. 

Edited by jdm
  • Like 1
Posted

I got my oils from a local watchmaker for free. 1-2 drops from the most common 3 types. You just need a kind and helpful watchmaker near you like i have :)

Posted

I reckon if maybe you found three or four small vials that you could sne d to someone then they might give you some samples. You'd want some decent oilers like those from Bergeon too.

  • 2 months later...
Posted

Hi all,

Thanks for your responses. I tried calling the only local watch repair shop but they were hesitant to sell small quantities unfortunately. Eventually, I ended up buying the oils off Cousins (which I hadn't heard of before, so thanks!). The only real expensive one was 9504 which you can only buy in £40 quantities, but fortunately, I was able to find some Molykote DX online for much cheaper, so I'm using that instead.

Regarding oilers, I'm using some thin needles. You can pick a small drop of oil/grease and I seem to be able to controllably apply it.

Amr

Posted
On ‎07‎/‎08‎/‎2016 at 5:59 PM, amrbekhit said:

Hello all,

A family member has a Tissot Bridgeport watch (Valjoux 7750 movement) that had stopped working, and, despite never taking a watch apart before, I decided to have a go at fixing it. Over the past few months, I've disassembled the watch (the problem was a loose screw, and another part that had come loose that stopped the chronograph reset from working) and I'm now ready to put it back together. Seeing as I've gone to all the trouble to disassemble it, it seems a shame if I don't take this opportunity to lubricate the parts. The ETA website has a very good step by step guide on how to disassemble and reassemble the movement (http://www.eta.ch/swisslab/7750/7750.html), including oiling points. I've had a search for those oils online, but if I were to buy them, it would cost around about £150-£200! I struggled to find the same oils on eBay. Seeing as this is a "one-off" thing I'm doing, does this community have any suggestions as to how I can just what I need to get by to do complete this repair project?

Thanks,

Amr

That's a great website ! good luck with the rebuild:thumbsu:

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    • Welcome to the forum, enjoy. 
    • Yes, the specific old tools do exist, but may be having one is not needed as they are not cheap, and also You will be able to do without it well enough. My advice will be to use regular depthing tool and adjust it for the exact distance between pallet fork and escape wheel bearings from the watch. Then remove the shellac from the pallet that now doesn't pass the ew teeth and move this pallet in. Then put the pallet fork and ew on the depthing tool and check how they lock. They should not lock when the pallet is in, but You will little by little move the pallet out and locking will appear. Then move just an idea out for reliable work and apply shellac, then check if things are still the same. You have to observe where the teeth fall on the pallets - it must be just a little below the edge between impulse and rest planes. Then You must check how everything behaves in the movement This Potence tool is so ingenious, but actually, the traditional way to do the things is much more simple. Arrange the parts not on the pillar plate, but on the cover plate. Only the central wheel will remain on the pillar plate, secured by the cannon pinion.
    • There is a tool that was made for setting up and adjusting escapements of full plate watches.  There were two styles, the picture below shows both of them.  The lower tool held a movement plate and the vertical pointed rods were adjusted to hold the unsupported pivots of the lever and escape wheel.  There was also a version of this tool that had 3 adjustable safety centres so that the balance pivot could be supported by the tool :  The other version I’m aware of is the Boynton’s Escapement Matching and Examining Tool came as a set of two or three clamps that gripped the watch plate and held the safety centres for the pivots : These do turn up on eBay from time to time.  For some escapement work, you can set up the parts in a regular depthing tool, with the centres set according to the distance between the corresponding pivot holes on the movement.  I hope this helps, Mark
    • Once you are aware of the problem, you can adjust as necessary. I have a couple of the Omega 10xx, and they are not my favourites. They seem a bit flimsy and not as solid as previous generation Omega. But I think that's true of a lot of movements from the 70-80s. For me, the 50-60s is the peak in watch movements, where the design criteria was quality, not saving the last penny.
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