Jump to content

Tissot sea star t12

RyanGreerMcGilloway
 Share

Recommended Posts

RyanGreerMcGilloway Watch Enthusiast

RyanGreerMcGilloway

Posted
Posted

Hi all.

 

i have just acquired this nice Tissot for a nice price.

 

i am currently stumped as to how this watch back comes off. I have tried unscrewing this but it stops half way and can’t physically go any further, I can’t seem to pop it off. I have broken a few screw drivers b y doing this and there doesn’t even seem to be a groove where it’s a typical pop off.

 

can somebody please help with this one? 

FACBF2CC-3C73-4F71-B850-E13D4E5DB609.jpeg

71CDAAF9-1E89-4455-AAEE-4D9681DEE11E.jpeg

F3842911-4CD2-4340-95CE-9B1AD05200F2.jpeg

MakingSpace Member

MakingSpace

Posted
Posted

Hi,
I have a few of these and the back does just screw off. Not sure why yours stops but I have had one or two that were quite stuck. They were stuck in the fully closed position and needed a lot of coaxing to start moving.
How much movement do you get before it stops?


Sent from my iPhone using Tapatalk

saswatch88 WRT Addict

saswatch88

Posted
Posted

Possible that some stripped threads while putting case back back on. It tends to be the first thread that gets screwed up since it could be hard to catch. I call it the lazy screw and press/death of a caseback method. They get first thread on wrong then press it down to get past it. by doing this it gets the back past the first initial thread and onto the next thread where the back will then screw on with ease. But from there the damage is already done to the first thread thus why you cant get it off all the way. 

Graziano WRT Addict

Graziano

Posted
Posted

I have just finished servicing the exact same watch and you need a 5700 style case back opener with the flat edged keys .Turn very slowly .The reason for it being so stiff is that the rubber o'ring is forced (compression)against the case back on closing and it has probably been there for years and sealed it shut

saswatch88 WRT Addict

saswatch88

Posted
Posted
1 hour ago, Graziano said:

I have just finished servicing the exact same watch and you need a 5700 style case back opener with the flat edged keys .Turn very slowly .The reason for it being so stiff is that the rubber o'ring is forced (compression)against the case back on closing and it has probably been there for years and sealed it shut

  The issue the OP is having is not breaking the seal of the caseback but getting it off completely. I think the issue is the first thread has a bent ridge which is locking the caseback up.

  • Like 1
RyanGreerMcGilloway Watch Enthusiast

RyanGreerMcGilloway

Posted
  • Author
Posted

Hi all.

 

it screws out about half of a full rotation and gets jammed. I thought initially that it was a screw off but being that I can’t get it off with all my strength, I thought otherwise. 


what do you propose I do in this circumstance? 
 

tah, 

Graziano WRT Addict

Graziano

Posted
Posted
26 minutes ago, saswatch88 said:

  The issue the OP is having is not breaking the seal of the caseback but getting it off completely. I think the issue is the first thread has a bent ridge which is locking the caseback up.

I see ,yes you are right , I have come across this a few times and have found that if you have a heavy duty case holder screwed to a bench top it gives you 2 free hands to try different options such as using a screw driver around the edge twisting it whist turning with the case back gently gripped in multigrips with a piece of thin cloth for protection and work your way around .It will come off

  • Like 1
watchweasol Distinguished Member

watchweasol

Posted
Posted

Hi   I take it you have not resorted to the super glue and nut method. first get a large nut and superglue it to the back and let it cure (over night) then with the appropriate spanner unscrew the blighter. To remove the nut fill the inside with acetone(nail polish remover) and leave to relase the nut. I have used this method on one or two stuck backs and it works, just clean off  the caseback .

  • Thanks 1
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • Neverenoughwatches
      Tool of the day.

      By Neverenoughwatches · Posted

    • nevenbekriev
      Bizarre state of the balance! Miyota 8200

      By nevenbekriev · Posted

      Of course, donor movement is needed, but the balance/hairspring assembly itself can be saved. OP, You just have to use tweezers and needle to straighten and two tweezers to untwist if needed to rectify the outer coil. What is seen in the middle may be is because the stud pressed to the spring, but we will need pictures after outer coil rectifying. The regulator and stud carrier are snapp-fitted on the antishock assembly. Lift and pry them together with some sharp tool and they will come off.
    • AndyGSi
      Bizarre state of the balance! Miyota 8200

      By AndyGSi · Posted

      A good learning piece but think for the price of a new movement that's all it is. Probably just transfer the rotor if it's Citizen branded.
    • Bonefixer
      Bizarre state of the balance! Miyota 8200

      By Bonefixer · Posted

      I'm no expert, but I'd guess this one is for the bin. Looks like it's been tinkered with by someone armed with a hammer and chisel. When the pallet, escape wheel and balance are all damaged it's beyond repair isn't it? Or a new movement if the watch itself is of value. 
    • Nucejoe
      Bizarre state of the balance! Miyota 8200

      By Nucejoe · Posted

      No need for special tools. Loosen stud screw and just push hairpsring stud out of the hole.  Regulator arm is spring circled around the setting housing, insert cutting edge of a safety blade under it,  opposit ( 180 degrees) to regu arm itself, and pry  half of the circle up, you then see how it all is made at put together. Remove the mobile stud carrier as well,  reinstal in proper order, first goes on the stud carrier, second put the regulator arm on top and press it home. Exactly as nev explained above. Trueing inner coils is done when balance complete is seperated from the cock.   The part thats bent over itself. 1-Unbend hairspring as much as you can when balance is seperated, just grab the hairspring stud in tweezers , grab hairpsring with another tweezers streighten with  strokes as you  move the second tweezers  away from the stud. 2-Move stud carrier and regulator arm as wide/ apart as they go , to provide max space which comes useful in next step. 3- Fit hairspring stud, into stud carrier hole. 4- Put balance and cock ( when attached together) back on mainplate.  5- You have enough space to grab hairspring in  tweezers to shape as you move your tweezers  away from stud.         
×
×
  • Create New...