Akwai shimfidar wuri mai ma'ana a tsakiyar farantin ƙananan, wanda yayi daidai da farantin tsakiya.Akwai farantin PTFE mai siffar baka wanda aka yi layi tsakanin su biyun.Siffar sararin samaniya tana zamewa da shi don gamsar da jujjuyawar ƙarshen katako;bakin karfen dake kan farantin kujera na sama yana kan farantin karfe na tsakiya.Sauran farantin tetrafluoroethylene ya ƙunshi saman zamewa na biyu, wanda ke kammala shimfidawa da ƙwanƙwasawa na katako saboda dalilai da yawa na bambancin zafin jiki.
1. Ƙwallon ƙwallon yana watsa ƙarfi ta hanyar sararin samaniya, kuma babu wani abu mai karfi na wuyansa, kuma ƙarfin amsawa akan kankare yana da daidaito;
2. Ƙwallon ƙwallon yana gane tsarin jujjuyawar motsi ta hanyar zamewar farantin polytetrafluoroethylene mai siffar zobe.Ƙarƙashin juyawa yana da ƙananan, wanda ya dace da bukatun kusurwa.Kusurwar ƙira na iya kaiwa fiye da 0.05rad;
3. Ƙaƙwalwar yana da aikin juyawa iri ɗaya a kowane bangare, wanda ya dace da gadoji masu fadi da gadoji masu lankwasa;
4. Ƙaƙwalwar ba ya buƙatar matsawa ta hanyar roba, kuma babu wani tasiri na tsufa na rubber akan aikin juyawa na bearings.Ya dace musamman ga wuraren ƙananan zafin jiki.
