The open wire shaft works well with the the torpeds body. You put your hook in the open end then squeeze the two eire ends and push them into the torpedo body hole.

 The closed eye is a help where you use a split ring for you hook to wire connection.

 The straight wire shaft works good on the TwisTech wire forming tool. The coils are good for troling spreaders. They will work for building spinners, but the shaft will have a little curve in if from the coil, you'll have to straighten this out.