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.Makamai marasa aiki gabaɗaya sun fi raunin sawa fiye da makamai na Pitman saboda aikin pivot da aka gina a cikinsu.