A bed for the bars is made by laying four wooden rails onto pins on the end blocks. Like the resonators, these rails do not firmly attach to the frame. Each rail has a series of pins with rubber spacers that support the bars. The bars are arranged into two groups, and a soft cord passes through the nodal holes in the bars of each group. These bars lay between the support pins, with the cord hooking the pins. On the outside rails, the pins have U-shaped hooks, and the cord rests in the bend. the inside pins have a hook that grasps the cord and holds the bars in place against the force of the damper pad. The two ends of the cord attach with a spring at one end to provide tension and flex.