i was cleaning my pre because i got chocolate on it and as i was cleaning the cracks, i popped off the volume button and the small circular foil looking thing popped off and i lost it somewhere on my carpet and i can NOT find it anywhere! it has a gold/bronze looking shield covering it. it's what makes that "bouncing" movement when you press the side volume up and down.

would anyone know if i can just find that one piece? i don't want to replace my whole pre just for this reason. i have pictures of what the piece looks like i just cannot post it at this time. PLEASE help me