A seat attachment device is provided that uses a single bolt to secure the seat rails to the seat attachment device and the seat attachment device to a post. An adhesive layer adheres the substrate layer to the facing layer. The electrode support is clamped in place relative to the diaphragm at the locations of the compliant ring flexures. relative to time of day, week, month andor year. The wall has an opening to allow passage of a projectile fired from the firearm.