Bill,
If an R model Darne is broken, that is usually what it is. If you have heard this little sermon of mine before, I'm sorry, but, it is worth repeating:

Never, EVER use a tool of any type to press on the forks of the main action spring on a Darne R model. Use only your finger. It only moves about 1/8th inch for removing the barrels. Using a tool will break the spring.

Sermon over.


Best,
Ted