Does anyone know how to install this? I bought one for my 12 fv short action. It came with no instructions. Before I get creative I thought I had better ask for help.

Do I pull the box and spring. If I do, it falls out the bottom. I am sure there is something simple, I just don't know what it is.... I do want to be able to go back to my internal box later.

Any help would be appreciated. thanks rc