I purchased a tandem 20amp breaker which I thought was going to allow me to put 2 separate 20amp's into one open slot in the panel, however when I attempt to install it into the panel box itself there is a little silver metal piece that prevents me from pushing the breaker all the way into the panel slot, is this supposed to be I have looked at the same breaker again in the store and they all have this. I have a cutler hammer break panel 200 and the breaker itself is a cutler hammer so I am sure it is the one I need it just won't push all the way in because of this metal piece, does anyone know what the issue is? Any help is appreciated.