BTW ...your PIC shows your bolt in the FIRED position ... you need to get back to the COCKED position in order to re-insert the bolt. Just being "persnickety".

What I do is re-install the bolt just a few threads deep with the firing pin in the FIRED position because you don't have to compress the spring. Then I move it to the COCKED position by placing the button against my workbench and pushing it to the COCKED position. After a few times of doing this, you should become a pro at it (I have) and THEN running the bolt all the way in.

Hope all this helps ya!