Easy way to put the spring back in is with a phillips screwdriver and a nail. Feed the spring into the tube as far as you can, then on the other end, insert the screwdriver and push into the spring until it is flush with the tube, now use the finish nail and put it in the hole in the tube, remove the screwdriver, replace stock bolt, remove nail.
So how do you remove the nail once it's inside the butstock? There is not much room in the manuver at all.
I will also look into a spring replacement, however I think the spring is in great shape and definetly tight...
If guns kill people, then pencils misspell words, cars make people drive drunk, and spoons made Rosie O' Donnell fat!