Thank you very much Richard,

it will certainly help.
I tried the screwdriver, but the case is really stuck, like last time.
I’ll wait for the removal plug I ordered at Brownell’s and see, otherwise I’ll again have to go to the gunsmith.
The remaining brass will immediately land in the waste bin.
I had enough of these accidents.
Now that I got the rifle perfectly sighted in with its original rear sight.
Even yesterday, the first shot was dead centre at 100 meters. The following 5 also all in the bullseye, event the last one, which broke.
And again, right when things were getting really funny....game over.
Arghhhhh!!!