Gufunga no kwikuramo ibiti nibisanzwe bifunga locknut. Nibikoresho bya pulasitiki idasanzwe yometse kumurongo uhoraho, kugirango imigozi yimbere ninyuma mugikorwa cyo gukomera, plastike yubuhanga iranyeganyezwa kandi itanga imbaraga zikomeye zo kubyitwaramo, byongera cyane ubushyamirane hagati yinyuzi zimbere ninyuma, zitanga kurwanya rwose kunyeganyega.