Ubwoko bwa McPherson bwigenga budafite ikintu cya kingpin, icyerekezo ni umurongo wa fulcrum, kandi mubisanzwe bihurirana nigitereko cyikurura. Iyo uruziga rusimbutse hejuru no hasi, fulcrum yo hepfo irazunguruka ukoresheje ukuboko kuzunguruka, bityo umurongo wikiziga hamwe na kingpin uzunguruka hamwe, kandi impengamiro yiziga hamwe na kingpin hamwe nikibuga kizunguruka bizahinduka.
Guhuza byinshi-byigenga guhagarikwa
Ubwoko bwinshi-buhuza bugizwe nubwigenge bugizwe na bitatu kugeza kuri bitanu bihuza inkoni no hejuru, bishobora gutanga igenzura mubyerekezo byinshi, kuburyo ipine ifite inzira yizewe yo gutwara. Multi - guhuza guhagarika bigizwe ahanini na byinshi - guhuza, gukurura imashini no gutemba isoko. Igikoresho kiyobora gifata inkoni yo kwihanganira no kohereza imbaraga zuruhande, imbaraga zihagaritse nimbaraga ndende. Igice kinini cya pin axis ya byinshi-ihuza yigenga ihagarikwa kuva kumupira wo hasi hinge kugeza hejuru.
