Jump to content

How to open caseback which does not have grooves or slots

k3l3k

By k3l3k
in Watch Repairs Help & Advice

 Share

Recommended Posts

k3l3k Member

k3l3k

Posted
Posted

Hi, Please could I get some directions on how to open the case-back for the watch in the attached picture? It does not have have grooves or slots on the display case-back. I have already tried the Bergeon ball. Which tool do I need? Thanks.

P20321-080336.jpg

P20321-080247.jpg

Link to comment
Share on other sites
watchweasol Distinguished Member

watchweasol

Posted
Posted

There is a high probability that it is a snap on back. There being no groove or indication is no disclaimer as some of these can be very tight having been fitted by machine. Try to insert a sharp  Hobby knife/safty razor balde into the seam working it to achieve a gap large enough for a case knife.

There are tools avaiable for removing case backs and bezels.  I use this type which has opened one or two stubborn ones.

caseback removal tool.jpg

Link to comment
Share on other sites
watchweasol Distinguished Member

watchweasol

Posted
Posted

If you can see a thread then it is possible it is a screw back, in such case the tool mentioned will be of no use, The sticky ball did not work so use the super glue method. Glue a large nut to the case back and when set use a wrench to un screw if sucessful soak the back in acetone (nail varnish remover) and this will release the nut. The case will be clean or cleaned with the same.  If its a screw back this will remove it for sure. Never had one fail .

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted
1 hour ago, k3l3k said:

I can see screw threading on the side of the case back and wondering if I need a suction type tool? 

From the unclear picture above there is no gap, how can you see threads?

 

6 minutes ago, watchweasol said:

If you can see a thread then it is possible it is a screw back, in such case the tool mentioned will be of no use

That is a glass back, even if one can get good adhesion to the glass it does not seem a good idea to placing force on it, beside it could just end leaving the seat. That being said, a screw back without slots, or any form of ridging would be an absolute first.

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted
20 minutes ago, k3l3k said:

I can feel a threading with fingers.

Sorry, how can you fell a thread if it's closed like an oyster? And if it's not fully closed it should not be that tight either.

However, since it's a quality watch, possibly is indeed a screwed caseback, the intended way to open and close it is to use a special crown rubber die on a bench opener, which presses on the metal bezel not on the glass. Never seen a such die or watch myself.

Link to comment
Share on other sites
jdm Distinguished Member

jdm

Posted
Posted
1 hour ago, k3l3k said:

OK, Some more pics.

Can you take two more in between the lugs, with the strap out ouf the way for as much is possible. And one from straight above capturing the numbers that are present in the picture from the internet. If these don't align at 12 or 6, that's normally an indication about being a screwed back. 

Link to comment
Share on other sites
  • 1 year later...
 Share
Go to topic listing


  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • Neverenoughwatches
      PALLET FORK INSTALLATION

      By Neverenoughwatches · Posted

      I'll go halves with them John , we can share it 😉
    • Neverenoughwatches
      Broken barrel arbor.

      By Neverenoughwatches · Posted

      Besides locktite Nev, is there anything random that you use to fix in the pivot ?
    • Terrinecold
      Unknown fossil service

      By Terrinecold · Posted

      Thanks Hector, I do think though that the problem I am experiencing is specific to Miyota movement in general and the 6T series in particular.  When you describe putting the bridge you are talking about the train wheels.  The problem here is that under that same bridge you have the 4 train wheel, the barrel, 2 extra winding related wheels and the center sweep pinion.  I can mostly put them in their holes but 2 of those (the 4th wheel and the second pinion are completely under the plate so I can't nudge them in the right position.   I managed it with a larger Miyota 8200 series but with the smaller 6T15 it is even worse. Anyway, I'll retry tomorrow evening or this week end.  This evening is going another rock climbing day (going from very light pressure on tweezers to much more force going through the fingers, although in climbing we also want to use the absolute minimum grip which won't make us fall to save the muscle and be able to climb longer routes). to add insults to injury, if you read this thread from the start, I initially messed up the disassembly as I couldn't detach the rotor.  I normally (and I think I did this time too) put all my parts in their individual compartments in the part tray and I am doing my best to be very careful about them.  But in the week and a half it took to figure out how to detach the rotor I somehow lost the screws from the bridge.  I have a few others which will be needed later.  I know they are reference 922-600 but I couldn't find what it means in general term so I don't know if I can buy replacements or an assortment of screws and replace those 2 by others.
    • Neverenoughwatches
      How to deal with shock setting

      By Neverenoughwatches · Posted

      Something that can happen with a lyre spring, the back of the arms can bind against the shoulders of the chaton cut out where the spring is fixed in when the spring is lifted out of the way. To stop the spring bending or breaking it needs pulling forward slightly before lifting so it clears the edge of the chaton.
    • nevenbekriev
      Broken barrel arbor.

      By nevenbekriev · Posted

      One way is to file it by hand. Good file with sharp edge is needed. Another way is with the aid of milling attachment. There is one more way, thyat is really only on the lathe, but the arbor has to be attached perpendicular to the axis of the spindle. Will be easier to show pictures than to explain this. I must say 'Good night' as my wife is now awake and is roaring when I get closer to the computer...
×
×
  • Create New...