Mochini o nang le likhalase tse phahameng tse phahameng ka ho fetesisa o loketse ho sila khalase e bataletseng e nang le mahlakore a mabeli a otlolohileng.
Ho sila ka mahlahahlaha, ho sila hantle, ho bentša tšireletso angle (lebili le kentsoeng la polokeho ea chamfering) hang ha ho phethiloe.
Ho thella ha hlooho ka tataiso e otlolohileng habeli, li-screw drive tse habeli ho fihlela lebelo le tsitsitseng la ho sisinyeha, ho felisa tumello ea mohala, ho fokotsa ho hanyetsa le likhohlano, ho etsa bonnete ba hore maemo a pheta-pheta.