This ball peen hammer has been ground into a rebated cross peen. I use this for stretching metal. It was one of my first hammers and I believe I have used it on every order in the last 13 years. I have to thank Craftsman for making such a good product :)
The plates of the cuisse and the lower lame of the leg are wider than the knee on the original suit so the wing needs to flair a little in order to accommodate proper articulation. To achieve this I expanded the steel at the top and bottom of the wing. Striking the areas with the cross peen causes the metal to stretch. The upper and lower areas tend to move outward from the centre and also causes the whole wing to curve slightly inward on its horizontal line.
Striking the peened area with firm hits using a subtle round faced hammer pushes out the high spots and causes the wing to flair and curve.
The next picture was taken after both top and bottom were hit with the cross peen but only one side was gone over with the face of the hammer.
Notice how much more shape is in the left side as opposed to the right.
After both top and bottom of the wing are expanded the wing is planished over the T stake or the horn of an anvil.
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