"A" series table base assembly "B" series table base assembly "D" series table base assembly "F" series Cantilever table base "G" series cantilever bases "H" series base/ 1500 stool core drill attachment detail "H" series attachment detail 215-782 stool assembly 751-752 Econo stool anchor clip 885 leg bracket Typical counter stool position Modular seating M41     Floor attachment details 1500-161 Stool assembly guide