Answer
Yin amfani da kayan aikin da ba su dace ba kamar surukutai ko ma'auni na yau da kullun don shigar da zoben karkace shine babban dalilin gazawa. Waɗannan kayan aikin suna amfani da 'nauyin ma'auni' maimakon matsi na radial iri ɗaya, wanda zai iya haifar da 'samar da ƙasa' ko 'kinking' zoben. Zoben da aka kidime ba zai zauna ba tukuna a cikin tsagi, wanda zai kai ga 'Loading point' akan bangon tsagi da gazawar da ba ta kai ba. Bugu da ƙari, screwdrivers sau da yawa yakan ɓata kayan, suna haifar da 'masu tashin hankali' waɗanda ke fara fashewar gajiya. Don shigarwa da hannu, 'Dental Pick' ko na'urar 'Spiral Ring Tool' na musamman ya kamata a yi amfani da shi don jujjuya zoben a hankali a cikin tsagi, farawa daga ƙarshen ɗaya kuma zagayawa kewaye.
