A patent was just granted for this: ACHILLES HEEL WEDGE Quote: An Achilles heel wedge has a front part, a back part, and a longitudinal axis extending in a longitudinal direction between the front part and the back part. A first wedge section defines a bottom surface and a top surface. The top surface of the first wedge section forms a convex portion curving along the longitudinal axis and extending between side portions of the first wedge section.
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Achilles heel wedge