Saboda haka zaɓaɓɓen raɗaɗin gwiwar gwiwar hannu na iya zama mahimmanci. Sauran nau'in ƙiren gwiwar suna rage ƙwararraki. A cikin wannan nau'in ƙwayoyin ƙwararraki, yanayin radius na cibiyar radius daidai zuwa rabin maras muhimmanci girman mafi girma. Rage gwal, sake, kula da canji mai gudana 90¡. A cikin tsarin bututun. Hakanan za'a iya ci gaba da canza wani nau'in canji na 180 ta hanyar amfani da takamaiman nau'in rage gwiwar gwiwar hannu wacce ake kira ¡®RETARN Take.