Creating new cover plate / detent spring

[NathanM]

I just got a new old watch in the mail to restore for a friend. Watch runs but is very dirty. Main problem is that the cover plate/ detent spring in the keyless works has broken. Some rust must have done its work to weaken the part. 
 

to get to the point, what would work as a base stock material for this part. And would any special tempering be needed to get the detent to function correctly. 
 

the time setting and winding still works. But I do not want to skip out on necessary repairs for this watch. 

[Kalanag]

This video shows the complete process including heat treatment of the carbon steel:

https://youtu.be/vCyPSjnNky4?si=K8BkG5XORIijcSS8

Edited December 18, 2023 by Kalanag

[NathanM]

Thank You, this is very helpful.

[mikepilk]

I use feeler gauges for the steel. There's a discussion on annealing here 

 

[mikepilk]

What's the movement ?

[NathanM]

It’s a ladies lusina Geneve 17 jewel. There is no serial or model number as far as I can see.

[CYCLOPS]

hi, it appears to be an ETA 980 [ETERNA 1025] which is an 8 3/4 line movement [ladies size] , you should be able to find a new perfectly fitting part at any supplier, Ebay etc.. A junk movement needs to be seen without a dial if you go that route.....I currently see one on eBay for 5$ plus shipping

[mikepilk]

If it's ETA 980, Cousins have the setting lever springs 

US Suppliers probably have them too.

Edited December 31, 2023 by mikepilk