WWT Shows CLICK TO: Join and Support Internet Horology Club 185™ IHC185™ Forums

• Check Out Our... •
• TWO Book Offer! •
Go
New Topic
Find-Or-Search
Notify
Tools
Reply to Post
  
balance staff for Hamilton 940 question "Click" to Login or Register 
posted
I have a Hamilton 940 that has a broken balance staff.

The movement serial number is 990631 can anyone advise which staff I need to get?

Thanks,
John
 
Posts: 29 | Location: Florida in the USA | Registered: June 15, 2015
IHC Member 1613
posted
John,
Not sure which staff you need..Do you know if it is a large collet or a small collet..Single or double roller and the size of the pivot..If you can answer these questions we can then tell exactly which staff you need...
 
Posts: 2015 | Location: Chesapeake City, Maryland in the USA | Registered: September 27, 2011
posted
Gary, the watch is a double roller. Don't know collet size. The original question was "My balance staff is broken. Which staff do I need to replace it.

I am a new member so I am still trying to figure out how to properly use the site.

John
 
Posts: 29 | Location: Florida in the USA | Registered: June 15, 2015
IHC Member 1613
posted
OK John that narrows it down some..The large and small collet has to do with the size of your hairspring collet..You have to know this because one will not work on the other..The staff number you need is a number 126 which is the double roller staff..

The 126 LC staff comes with a pivot size 10 (new number 607010)..

The 126 SC staff comes with the pivot size of 11 or 12 (new number 607011 and 607012).

Pivot size is important because if you get the wrong size pivot you might have to change the jewels to make the staff work..
 
Posts: 2015 | Location: Chesapeake City, Maryland in the USA | Registered: September 27, 2011
IHC Member 1613
posted
John you can also see this if you go to (Hamilton Movement Numbers and Horological Reference Material)..

Click on that and in Lindell first post go down to (Direct Link to 1961 Parts and Material Catalog) Open that link and you will find the info you need under Balance staffs..
 
Posts: 2015 | Location: Chesapeake City, Maryland in the USA | Registered: September 27, 2011
posted
Thanks Gary. You have put me another step closer in figuring out what I need.

Have a great day.

John
 
Posts: 29 | Location: Florida in the USA | Registered: June 15, 2015
  Powered by Social Strata  
 


©2002-2023 Internet Horology Club 185™ - Lindell V. Riddle President - All Rights Reserved Worldwide

Internet Horology Club 185™ is the "Family-Friendly" place for Watch and Clock Collectors