Jump to content

Omega 861 "Stuck broken screw" :-(


Recommended Posts

Hello All;

I know pretty well the history of this 1975 Speedmaster Mark II, it used to be my brothers, and somewhere along the timeline a watchmaker has twisted / sheared the top of a screw, holding the operating lever 1720, off.

Screenshot 2023-01-07 at 10.51.11.png

I discovered this when I first got my hands on this watch in 2017: https://www.watchrepairtalk.com/topic/6842-omega-861-speedmaster-mark-ii/

At that time I didn't succeed to get the remaining part out. The screw-head is literally hanging on onto one thread. The screws acts as a "guide" for the lever.

S20230107_004.jpg.610be11a9445706f739f9d736579dbf4.jpg

The stuck piece sits just below the edge of the bushing (barrel / train bridge)

S20230107_001.jpg.cb2ba3c6370f7fdae2478a8862165d1a.jpg

On the other side the screw seems to be a bit tapered.

S20230107_002.jpg.88a1f6149b1e757a430e1647aec67e63.jpg

I tried with two pieces of peg-wood, one on either side, with friction to screw the part out, but no joy. Two small screwdrivers just slip over and I don't want to damage that little piece of thread the screw-head is just hanging onto?

I don't have a fancy broken-screw remover and of course, there is a reason why the head was twisted off; the remaining part must be pretty stuck.

Has anybody some good tips which I could give a try?

 

 

Edited by Endeavor
Link to comment
Share on other sites

  • 2 months later...

Hi Endeavor!

I'm quite new and started out with some old pocket watch movements and twice I've run in to this problem.

First I tried to drill it out by mesuring the diameter of the screw and trying to drill with a smaller size drill as to create an opening with threads around, force a V-shaped screwdriver in and try to get it out that way.

I failed though. The drill managed go drill away the screw, threads and now I have a hole, slightly lager (1,2mm)and my next course of action will be to get a new threading in and purchase a screw that will fit and eventually I think I can salvage it.

I think I failed because of lack of hugg precision tools, used a regular powered drilling machine and it couldn't quite grip the 1mm drill so I guess it wabbled ever so slightly.

As I mentioned I have a another screw stuck in ny father-in-laws old family pocket watch so I hope someone wiser and more experienced will enlighten you and me both. You can kinda view what I did more or less as a "What not to do" 🙂

Cheers!

Fredrik

Link to comment
Share on other sites

Endeavour! I was sleepless last night and asked uncle Google and found something called "a screw extractor tool" 

Cousins has the Bergeon one and chinese more affordable option

https://www.cousinsuk.com/product/screw-extractor-bergeon-swiss?code=S1517

This hobby isn't a cheap one.... But I grow richer in tools as the days go by 🙂 I chose the cheaper option, 30 £, since I hope this isn't a tool I will need that frequently and there are always things to spend money on. I will post again once it has arrived and I can tell you more about it.

Cheers!

  • Thanks 1
Link to comment
Share on other sites

14 hours ago, Fredrik said:

Endeavour! I was sleepless last night and asked uncle Google and found something called "a screw extractor tool" 

Cousins has the Bergeon one and chinese more affordable option

https://www.cousinsuk.com/product/screw-extractor-bergeon-swiss?code=S1517

This hobby isn't a cheap one.... But I grow richer in tools as the days go by 🙂 I chose the cheaper option, 30 £, since I hope this isn't a tool I will need that frequently and there are always things to spend money on. I will post again once it has arrived and I can tell you more about it.

Cheers!

The Chinese versions that I have looked at seem to have different extractor tips than the Bergeon one. The Chinese ones look like they are meant to drill the screw out vs. the Bergeon one where the extractor tips have a "claw" on the tip to grab the screw with friction and then you twirl the plate the screw is in and it backs the screw out. So I'd be interested in hearing how the Chinese version works for you when you get it. I also wonder if the Bergeon extractor tips, which can be purchased separately, would fit in the Chinese version.

Link to comment
Share on other sites

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.



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • I must say I'm the same, buying a complete set of something saves a lot of time and effort but there is a certain type of gratification for me hunting out all the add-ons.  Ps hands down having a psychotherapist for a wife is way better than having a psychopath for a wife in my experience 🙄  
    • Mark, good info.   My attempted photo through 10x loupe.  Not the best but an effort.  As much as this sounds dumb, the HS has increased its gap from the the cock.  And, seems to spin 3 times longer.  I think I have some residual fiber from my pegging.  What is small enough to clean out these pivots? Or is this where the L&R correct cleaning product helps?  Liquid movement will ensure the pivot holes are clear?  Yup, I have 3x cheaters and the 10x Loupe.  I will have another run at examination.  Everflex green sticks.  Quick google, will have to dig deeper.  Perhaps that is the key to clean pivot holes.   Noted on mixing Naptha based solvent and IPA, water based.  I have a gallon of Coleman White Fuel for about 15 years.  Time to use it and use as rinse.  I stumbled on a L&R Master for $20 with all original L&R jars and lids.  Just have to research basket, a topic for a different post and I am forcing myself to not get distracted by this premature acquisition and practice with my tools. For now, the main spring will not get attention.  After I put the watch together and running, a small miracle, I don't think the main spring to be a major detractor for practice.  My plan is to have my watch maker service my main spring.  Support local small business and he always shares knowledge when I visit.
    • Hi Ammar, I couldn't find anything about the chemical resistance of PLA to naphtha. According to these sources it doesn't rate too well. I think that your concern is correct. If you did a final rinse in IPA after the parts are out of the basket my guess is it would be fine. I have no affiliation in either of these companies. https://prusament.com/chemical-resistance-of-3d-printing-materials/ https://www.filamentive.com/chemical-resistance-of-3d-printing-filament/
    • Yes that is right. No offence intended. 
×
×
  • Create New...