Threaded stud Walther Model V, pre-WW2

[lweinlan]

I have a pre-WW2 .22LR Walther Model V that has some kind of threaded stud on the right side of the stock -see red arrow on attached picture- .
I know that this stud is original to the rifle. I have seen it on other Model V pictures.
What is the purpose of this stud ??
Thank you for your help.

[Jess B. Guy]

The hole under the bolt handle gives access to the trigger adjustment screw.
So I'm told.

[lweinlan]

thank you