by Raymond » 12 Sep 2022 13:53
Measure the diameter of the post seen in picture through the keyway. Also measure the length of the keyway from top to bottom, (The inner part of the lock case, not the decorative outer part with the screw showing.) Take these measurements with your picture to a full service locksmith. Many different keys will most likely work without modification.
Nothing is foolproof to a talented fool. Wisdom is not just in determining how to do something, but also includes determining whether it should be done at all.