Lishenflex dị ka onye ọkachamara na-emepụta eriri ratchet na-emepụta na onye na-ebubata ya na China, ihe niile na-eme ka eriri ratchet agafewo ụkpụrụ asambodo ụlọ ọrụ mba ụwa, na ị nwere ike ijide n'aka nke ọma. Ọ bụrụ na ịhụghị ihe nke gị n'uche na-eke eriri ratchet na ndepụta ngwaahịa anyị, ị nwekwara ike ịkpọtụrụ anyị, anyị nwere ike ịnye ọrụ ahaziri iche.