Don't know if you go ice fishing but if your looking for something to make. A small hand chisel ( about a 4 foot handle with a 3 to 4 inch blade) [ both handle and blade are in a straight line] to reopen already drilled hole as they tend to refreeze in on cold days. Most people these days have power angers to drill the holes, and a hand chisel can be used without disturbing the fishing line. Usually a leafe spring has a slight curve which is great for this application.