Affix Mechanical Wave Driver to Rods for Adjustable Height

How do I affix the mechanical wave driver on a double rod that will have a greater rigidity to prevent the oscillation of the support for the mechanical wave driver.
www.pasco.com/structures/#widget_1_slider_4
www.pasco.com/prodCatalog/SF/SF-9324_mechanical-wave-driver/index.cfm
www.pasco.com/prodCatalog/ME/ME-8735_large-rod-base/index.cfm
www.pasco.com/prodCatalog/ME/ME-8738_90-cm-stainless-steel-rod/index.cfm