User blog comment:Xilinoc/Ch. 624 - THE FANG/@comment-24726378-20150425144840/@comment-7805464-20150427105523

That "switch-looking thing" might be another new invention by Urahara to open a garganta when activated to the RR from Hueco Mundo or anywhere and maybe another person from the RR side is also needed to open it (like Yoruichi).