1, bigomba kuba byoroshye kandi byoroshye, nta gucikamo ibice, impande zikarishye no gutwikwa nizindi nenge, imikoreshereze yikirahure kinini nibindi bice bishobora gusubirwamo.

2, ingoyi kugirango wikubye kabiri umutwaro wumutekano nkumutwaro wikizamini. Igiti cya shaft ntigomba guhindurwa burundu kandi kubuntu kuzunguruka nyuma yo kurekura. Uburebure bwumubiri ntibushobora kurenga O.25% cyangwa O.5mm. Toni 300 yikubye inshuro 2 umutwaro wumutekano nkumutwaro wikizamini cyo kugerageza, toni zirenga 300 zinshuro 1.33 umutwaro wumutekano nkumutwaro wikizamini cyo kugerageza.

3, ingoyi irashobora kuba icyitegererezo cyo kwizerwa. Umutwaro wikubye kabiri umutwaro wikizamini. Ingoyi ntishobora kumeneka cyangwa ingoyi yangiritse.

4, gukoresha ingoyi yumutwaro wumutekano biremewe M (4).

5, muri buto umubiri ugomba gushyirwaho urwego rwimbaraga, umutwaro wumutekano nibindi bimenyetso.