Hannun mara aiki yana goyan bayan ƙarshen hanyar haɗin yanar gizo a gefen fasinja na abin hawa.Hannun da ba shi da aiki yana toshewa ga firam ɗin abin abin hawa.Gabaɗaya, ana haɗe hannu marar aiki tsakanin kishiyar gefen cibiyar haɗin gwiwa daga hannun Pitman da firam ɗin abin hawa don riƙe hanyar haɗin yanar gizo a daidai tsayi.