In order to get more threads, you have to make sure the cocking pin is forward. With the cocking pin forward you can turn the bolt screw in just a bit (not too much). After you do this you have to push the cocking pin back into the cocked position.....to do this I place the back of the bolt screw on a flat wooden wall surface and push the cocking pin back with a piece of wood. After that screw the bolt screw in all the way.