Injin a cikin aiwatar da aiki ba makawa zai bayyana yanayin jitter, a wannan lokacin sashin injin yana da mahimmanci. Yin amfani da goyan bayan injin ba zai iya gyara matsayin injin ba kawai, amma kuma ya bar injin ya guje wa jitter, don kare lafiyar injin yadda ya kamata, ta yadda mai shi zai iya samun tabbacin tuƙi. A cikin sauƙi, tallafin injin ya kasu kashi biyu. Ɗayan ita ce goyon bayan juzu'i, ɗayan kuma manne ƙafar injin. Ana amfani da manne ƙafar injin don gyara shaƙar girgiza. Matsakaicin juzu'i nau'in na'urar bugun injin ne, yawanci ana haɗa shi da injin da ke gaban gatari na gaban jikin abin hawa. Bambance-bambancen mannen ƙafar injuna na yau da kullun shine cewa manne ƙafar wani rami ne da aka girka kai tsaye a kasan injin ɗin, kuma ƙarfin jujjuyawar yana kama da kamannin sandar ƙarfe da aka sanya a gefen injin ɗin. Hakanan za'a sami mannen birki mai ƙarfi akan madaidaicin juzu'i, wanda ke aiki azaman mai ɗaukar girgiza. An ƙera mashin ɗin injin ɗin ne don ya riƙe injin ɗin a wurin, don haka idan wani abu ya yi daidai ba zai riƙe shi ba. Sa'an nan kuma, lokacin da injin yana aiki, tabbas za a sami matsalar jitter, kuma a cikin yanayi mai girma, ba tare da ambaton ba, ba kawai tare da sautin "boom" na al'ada ba, kalmomi masu mahimmanci zasu sa injin ya fadi.
