Hanyoyin da mafita don sarrafa nadawa waje sune kamar haka.
①Tabbatar da ingancin billet. Bai kamata a sami kumfa a saman billet ɗin ba, kuma a tsaftace fata mai sanyi, kumburi da tsaga a saman billet ɗin, kuma gefen tsagi bayan cirewar ya kamata ya zama santsi.
②Ana buƙatar ƙimar juzu'in juzu'in ba zai iya zama mai zurfi ko tsayi ba, kuma gefuna na daraja dole ne ya zama santsi.
③ Daidaita tsarin wucewa na injin huda da birgima. Idan saman nadi yana sawa sosai, yakamata a canza shi cikin lokaci.