OK, the taper of the toggles explains the way the marks are. But, looking at the last pic, what is giving the appearance of a triangular area of surface which looks undisturbed, it points up into the area of the ramp (pic left) that would be expected to be worn in a mirror image of the wear on its counterpart (pic right)--as if there is a chunk missing on the toggle knob that has hit it. Or is it a photographic artifact?
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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