Jump to content

ETA 2472 - how to tackle this crown and stem?

Michalzeszen
 Share

Recommended Posts

Klassiker Distinguished Member

Klassiker

Posted
Posted (edited)

The spring keeps the threads of the crown and crown tube separated while you are winding the watch. It will work without, but the risk of the thread engaging, or worse, cross-threading, is high. The split stem needs to give the crown enough end float to disengage from the thread, but leave the main part of the stem and the keyless works in the winding position.

4 hours ago, Michalzeszen said:

And is there a possibility to convert it to a springless system by replacing it with a standard split stem model?

A standard split stem will probably not have the end-float you need. It has no advantages over a one-piece stem in this application, because when you unscrew the crown the stem will be drawn out and the keyless works will move from the winding position to the setting position.

The conventional reason for having a split stem is to enable removal of the movement when the stem release is not accessible, e.g. when you have an integrated case back. As has already been pointed out, you don't need this feature.

Hopefully your watchmaker pal will get the screw-down feature to work in harmony with the "special" split stem he has in stock. If not, ask him to remove the screw-down feature ( remove the thread from the crown and / or case) and fit a conventional stem.

Edited by Klassiker
  • Like 2
AndyGSi Distinguished Member

AndyGSi

Posted
Posted

Not while maintaining the screw down crown as I mentioned above.

12 hours ago, AndyGSi said:

If they want to use the original screw down crown then yes it's necessary, otherwise there's no play from the winding position to screw it down

  • Like 1

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Recently Browsing

  • Topics

  • Posts

    • Neverenoughwatches
      Esape wheel moves to much

      By Neverenoughwatches · Posted

      That's good Andrea, everyone should feel equal, and we are all here to help each other......apart from AndyGSi and myself apparently .
    • mikepilk
      Esape wheel moves to much

      By mikepilk · Posted

      Again 🤣  
    • Nucejoe
      Luminox 7050

      By Nucejoe · Posted

      It might start and work for a few minutes/ hours,  then stop, or run slow. 
    • AndyGSi
      Luminox 7050

      By AndyGSi · Posted

      Welcome to the forum. Swapping a movement is probably one of the simplest jobs with the most difficult part for a newbie being removing and replacing the hands. Ronda 505 movements are still available and depending where you are in the world as to the cost. The thing you need to be aware of is the variations of this movement.
    • JohnR725
      Elgin Grade 315: Runs/stops with dial down/up

      By JohnR725 · Posted

      Just because I like clarifications of things? Typically on American pocket watches with jewels held together with screws their only disassembled for cleaning. Then the reassembled and for oiling their oil from the backside. As it would be extremely unlikely that you can oil the end stone and somehow pop it altogether and expect the oil the stay in place plus the little tiny screws are really not meant to be going in and out on a continuous basis as they will strip. So basically disassemble you can clean the push them all back nice and solid put the screws in and then oil from the backside like in the image below. Small drop of oil is placed like in the figure a. Small tool is used to bleed the oil down. They do not recommend using the balance staff of the watch you're using you could use some other balance staff I usually have a much smaller staff I find it works quite nicely. Then it's a little hard to see but an image's C the oil is held in capillary action where it's supposed to be. Then I have a link to a book that covers this and all sorts of interesting things to read about for pocket watches. https://archive.org/details/TM9-1575    
×
×
  • Create New...