Removing stuck screw in barrel arbor

[Bonzer]

The screw was stuck in thus pocket watch arbor. Despite leaving it to soak WD40, I managed to shear off the screwhead. Is this the sort of thing alum would be good for?

Also, any idea which movement this is? - it is marked as ASSA on the mainplate and the only number is a 2 stamped somewhere else. I understand that ASSA is the same as A Schild (AS) but there is no movement number 2 showing up on Ranftt.

 

Edited April 16, 2021 by Bonzer
spelling correction

[watchweasol]

Hi  Alum will be a non starter as it eats steel alternatives are a new arbour or drill it out, or use a screw extractor. 

some of these screws are LH thread.    attached is the screw extractor. As for finding the details of the watch try pocket watch database. Mikrolisk which gives makers mark info.  cheers

[Bonzer]

Thanks, I didn't realize these screws can be LH thread too 

Mikrolisk confirms that ASSA is A Schild. I just need to identify the movement now. Thanks

[Bonzer]

I've since managed to extract this screw. What are my chances of obtaining a replacement, do you think?

The screw head is 3.4mm dia

Thread LH 0.95mm dia, 1.5mm long

Is there a supplier that would be able to help?

[jdm]

42 minutes ago, Bonzer said:

Is there a supplier that would be able to help?

One always starts with an internet search

https://www.ebay.com/itm/CROWN-WHEEL-SCREWS-144-pieces-LEFT-HAND-THREAD-FAVORITE-824-B-/274101249903

https://www.cousinsuk.com/product/crown-wheel-screws-wristwatch-assorted

[Bonzer]

Thank you jdm. I was aware that Cousins sold an assortment but I wasn't sure if it might be possible to order specific sizes from somewhere - although I can see why materials houses would perhaps prefer to sell an assortment. 

Thanks for the links 

[jdm]

17 hours ago, Bonzer said:

 I was aware that Cousins sold an assortment but I wasn't sure if it might be possible to order specific sizes from somewhere - although I can see why materials houses would perhaps prefer to sell an assortment. 

It's extenuating to try to buy a single screw, which is then paid a lot more per unit, heaven forbids one breaks or lose it again. What we could do is to buy or sort some assortments individually and then sharing on a running thread what is available for free to other members. I will begin with Seiko 7S, and Swiss setting lever screws, hope someone else will follow.

[Bonzer]

Sounds like a great idea