Official Answer
Answer
Impeta ya spiral isanzwe ikozwe mubyuma bikonje bikonje. Imbaraga 'kwizirika', zituma impeta yicara muri ruhago, ni imikorere yimpeta yashizwemo. Niba impeta irenze urugero (yoroshye cyane), izahinduka muburyo bwa plastike mugihe cyo kuyishyiraho, gutakaza 'kwibuka' no kunanirwa gukomera. Niba idafite uburakari (birakomeye cyane), iracika intege kandi irashobora gucika mugihe cyo kwaguka isabwa kunyerera hejuru yumutwe. Intego ikomeye ni 45-52 HRC. Iringaniza ryemeza ko impeta ishobora kwaguka $ 10-15 \% $ ya diameter mugihe cyo kuyishyiraho hanyuma igasubira mubunini bwayo kugirango ihuze neza.
