OR............... get yourself a small half round files, anneal it and file, grind it to a round tip filing.grind all the file serrations off till it's smooth. Heat it to bright red hot and dip in clean water, shine it up then reheat slowly till a straw colour and dip in oil. You will have a scarper/hole de-buurer for life.
I did this over 50 years ago in my first week in a tool room, i still have it and never sharpened it. Old school.