Answer
'Groove Rolling' yana faruwa ne lokacin da nauyin turawa ya sa bangon tsagi ya lalace ta hanyar filastik, yana haifar da ramp ɗin da ke ba da damar riƙe zoben don zamewa. Wannan ya dogara sosai ga 'Squareness' na ɓangaren da aka riƙe. Idan fuskar ɓangaren da aka riƙe ba ta zama murabba'i ba zuwa madaidaicin shaft, yana amfani da kaya mara daidaituwa ga zobe. Wannan yana haifar da lokacin karkatarwa (ƙarfin ƙarfi) wanda ke tattara ƙarfi a gefe ɗaya na tsagi. Wannan damuwa da aka keɓance ya zarce ƙarfin samar da kayan gida da wuri fiye da nau'in kaya iri ɗaya. Binciken gazawa yawanci yana nuna gefen tsagi na 'baske' ko 'flared'. Rigakafin ya ƙunshi tabbatar da fuskar ɓangaren mating ɗin daidai yake tsakanin $0.002$ inci kowace inch na diamita.
