Mukagwiritsa ntchito mpando wolimbitsa thupi wochita zinthu zambiri, choyamba chotsani chopumulira cha mkono chosunthika, kenako pamakhala pulagi ya diamondi zisanu ndi chimodzi kumapeto kwa chopumulira cha mkono chosunthika. Ndikofunikira kuyika pulagiyo mu jeke ya makina osinthira a torsion spring. Thupi la munthu likakhala pampando, lidzagwiritsa ntchito mphamvu ya manja, mapazi, manja ndi miyendo kukoka kapena kukoka chopumulira cha mkono chosunthika kumbuyo ndi mtsogolo. Kuphatikiza apo, aliyense akhoza kusintha ngodya ya chopumulira chammbuyo malinga ndi zosowa zake, kapena kutulutsa bolodi la pulagi mwachindunji, kutulutsa bolodi losunthika ndikutembenuza chothandizira, kuti thupi la munthu likhale lathyathyathya, lokhala pansi kapena lathyathyathya.