Isikhokelo somgca siquka umzila kaloliwe, ibhloko, izinto eziqengqelekayo, umgcini, umva, isitywina sokugqibela njl.njl Ngokusebenzisa izinto eziqengqelekayo, ezifana ne-roller phakathi komzila kunye nebhloko, isikhokelo somgca sinokufikelela kwinqanaba eliphezulu lokuchaneka komgca.Ibhloko yesikhokelo somgca yahlulahlulwe ngohlobo lwe-flange kunye nohlobo lwesikwele , ibhloko yohlobo oluqhelekileyo, ibhloko yokuthwala kabini, uhlobo olufutshane lwebhloko.Kwakhona, ibhloko yomgca yahlulahlulwe kumthamo ophezulu womthwalo kunye nobude obuqhelekileyo bebhloko kunye nomthamo ophezulu womthwalo ophezulu kunye nobude bebhloko ende.