Modified C-hubs with holes for mounting graphite human anatomy upstop with height adjustable destination to deal with once the human anatomy details the graphite stops. The C-hubs work big areas for faster & easier assembly/disassembly of ECS. The complete ECS installation may be simply inserted/removed through C-hub without necessity for disassembly. The big areas prevent collision of ECS with C-hub in serious crashes. Caster pre-set at 4. moderate rigidity for carpeting competition. Usage with matching left-side C-hub #302364-M.