How do I place one item down?

I am trying to make it so you can place an item down which is the school bag shield by pressing shift, and it can work as a shield to block enemy propellants. You only have 5 of these schoolbags to place, which I’ve already sorted out. However, I tried using the emit tool and it spawned behind me. Then I made it so the force propels it forward a little bit. That worked, but it emitted more than one schoolbag. I don’t know what the attatcher does exactly, but I tried using it and it was a disaster. So is there any way I can just spawn one item in, and am I doing something wrong with the items, character, or both? Heres the link to my game: http://www.flowlab.io/game/play/132938