If you have never peened metal before, a peening jig is advisable. The peening jig comes with two differently shaped caps. The first cap reaches approximately 4 mm from the blade edge.
The second flattens the metal nearer the edge and thus produce a bevel. Once you have mastered the art of peening with a jig, you could try peening with a specially designed peening anvil and hammer. The advantage of peening with a hammer and anvil is that, once you have mastered the skill, you have much more control over the process.
However, it is much easier to damage the blade when peening freehand. For more detail on peening, please see the Scythe Connection's webpage http://www.scytheconnection.com/adp/docs/peening.html. More.
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