For sale are seismic safety systems for barrel racks made by Western Square. These systems are rectangular steel frames with ball bearings that are placed on the ground underneath your barrel stacks. In the event of an earthquake, the system allows barrel stacks to slide against the shifting ground to maintain an upright position and prevent stacks from toppling. The system's footprint does not extend beyond the typical Western Square barrel rack so it does not require any additional cellar space. I am happy to email photos if you are interested.
We purchased these for $439 each, asking only $75.