2. Umutwaro uhagaze hamwe nurwego rwumutwaro uhagaze hamwe nurwego, imipaka yo guhindura imipaka igabanya ibisabwa;
3. Umutwaro wa leta (gukoresha bisanzwe), umutwaro ntarengwa (akazi gakomeye);
4. Ibisabwa kugongana, imbogamizi no gupakira, imbogamizi zumwanya, ibyifuzo byateganijwe kandi bisabwa;
5. Uburyo bwo kwishyiriraho (harimo ingano ya bolt, ubwoko, icyerekezo nibisabwa kurwanya anti-rotation)
6. Umwanya wo kuzamuka (ahantu hinjira cyane, utumva);