My uncle and dad used to use old silver teaspoons years ago.
Cut the handle off, drill hole each end.
Hook one end, line to the other end. bash the curved spoon part to make it move and swim differently. Thjis was done at the time of fishing, just watched how it moved and bent it as needed.
Worked wonders for trevally and tailor off the rocks round culburra, crookhaven river, currarong, jervis bay area.