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<p>[QUOTE=&quot;John Anthony, post: 1622102, member: 42773&quot;]Yes, I watched a video of the process and that&#039;s exactly what I saw as far as the annealing furnaces are concerned. But Matthew&#039;s point that the hairlines are caused before the strike is still valid I think. The punching, rims, washing, tumble polishing, and machine sorting must take its toll.</p><p><br /></p><p><br /></p><p><br /></p><p>So there is a correlation between weakly-struck areas of the device and the concentration of hairlines in the fields of those areas - but it&#039;s not a matter of metal flow, but rather lack thereof.[/QUOTE]</p><p><br /></p>

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