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<p>[QUOTE=&quot;Bill in Burl, post: 26246167, member: 23692&quot;]I always thought and read that MD (mechanical or machine doubling) was caused by rotational movement of the die upwards in the millionth of a second after the strike. The die then can partially rotate as it&#039;s coming up off the planchet because it&#039;s a little loose in the holder.&nbsp; Once the floor worker tightens down the die-holders/screws, then the die is good and doesn&#039;t move any more.&nbsp; It IS more common with a die that has struck too many coins because the depth of the design indentations is less.[/QUOTE]</p><p><br /></p>

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