Let's look at how to change a Mauser spring.

First, you cock the piece, rotate the safety to the top position, and remove the bolt from the rifle.

Then you can push in the take-down button to allow the rotation of the bolt.

Unscrew it completely.

And then it will come out of the bolt, with the spring around the firing pin.

Some folks might have wondered what the round metal lined hole in some Mauser stocks is for.

It is a bolt-take-down tool.

Place the bolt in the hole.