Having used the Picard peening hammer in a variety of situations, we had some doubts about the striking surface, and the marks it leaves on the blade when peening.
On consultation with Peter Vido he assured us that he doesn’t “think that the depth of grooving (as they come) is detrimental“. We subsequently found that Steve Tomlin from Scytherspace UK, had similar concerns to ours, and said that the hammer should be polished “in order not to leave corresponding marks along the blade which result in a serrated edge and are potential sites for cracks to start“.
We haven’t seen what we’d quite call a serrated edge yet, but in a favourable light (or unfavorable, depending on how you look at it), we’ve noticed that the small ridges on the face of the hammers do leave marks on the blades.
We have decided that we will be polishing the surfaces of the hammers that we sell from now on since the edges of our blades are so thin. For anyone who has already purchased one of our hammers, Steve Tomlin gives a good method description here:
We’ll also keep you posted on what method we find to be most useful/easy – it will probably be less elbow grease and more machinery, since we have more than one to polish.