1. Gutigita.
Iyo vis ifite ingese, ntibyemewe kuyikuraho ku ngufu ukoresheje urufunguzo. Kanda kuri vis ukoresheje urufunguzo, gabanya ibintu byose uko byakabaye, hindura vis ibumoso n'iburyo ukoresheje urufunguzo, hanyuma ushobora gukuraho vis. Yasenyutse.
2. Umuriro.
Niba screw ifite ingese nyinshi, ushobora gukoresha amashanyarazi yo gusudira kugira ngo ushyiremo screw mu cyuma gishyushye, utwike screw itukura, hanyuma ushyire amavuta yo kwisiga mu mwenge w'icyuma gishyushya, utegereze igihe, hanyuma ukureho screw ukoresheje urufunguzo.