]A na-ejikarịigwe nkwakọ ngwaahịa lubrication na mmezi nke atọ nkịtị n'ibu n'ime dị iche iche metal artifacts, otú mkpa mmanu mmanu, oge maka onye ọ bụla nke nkwakọ igwe gia ntupu, ndokwa ushering bearing oiling oghere na-ejuputa mmanụ lubrication na akụkụ na-akpụ akpụ, nke mere na ọ nwere ike kwere nkwa mgbanwe nke ọrụ. .

