1. Umutwe ugomba kuba uzengurutse (iyi nayo ni igipimo gisanzwe cyumutwe wose uzunguruka). Kubera ibibazo byumusaruro, umutwe wimisumari yumye yakozwe nababikora benshi ntibashobora kuba bazengurutse cyane, ndetse bamwe bashobora no kuba kare. Ikibazo nuko kidahuye neza nu cyuma cyumye, kizengurutse uruziga, hafi y'ingingo nkuru, bigomba kumvikana.
2. Gira ingingo ityaye, cyane cyane niba ukorana nicyuma cyoroshye. Inguni ikarishye yimisumari yumye isanzwe isabwa kuba hagati ya dogere 22 na 26, kandi Inguni ityaye yumutwe isabwa kuba yuzuye, idakwega insinga no guturika. Iyi "point" ningirakamaro cyane kumisumari yumye, kuko ikoreshwa idafite imyobo yabanje gukorwa kandi irayinjizamo, iyo ngingo nayo yemerera kwinjira. Cyane cyane iyo ikoreshejwe mumashanyarazi yoroheje, inama mbi izaganisha ku kudatobora, bigira ingaruka kumikoreshereze. Ukurikije ibipimo byigihugu, imisumari yurukuta igomba gushobora gucukura muri plaque ya 6mm mumasegonda 1.
3. Ntukabe intangarugero. Inzira yoroshye yo kumenya niba umusumari wumye ari eccentric nugushira kumeza, kuzenguruka umutwe hasi, ukareba niba urudodo ruhagaze kandi hagati yumutwe. Niba imigozi ari eccentric, ikibazo nuko ibikoresho byamashanyarazi bihindagurika iyo byinjiye, wobble. Imiyoboro migufi ni nziza, ariko ndende irashobora kuba ikibazo kinini.
4. Ahantu hambukiranya hagomba kuba hagati yumutwe uzengurutse, bitabaye ibyo ibintu bimeze nkibya 3.
Igihe cyo kohereza: Gicurasi-16-2023