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<p>[QUOTE=&quot;cpm9ball, post: 1681618, member: 24633&quot;]David, in order to keep the machinery operating efficiently, lubricants are necessary just like any other mechanical device. These lubricants can adhere to planchets at most any point on the production line and then be transferred to the dies in the course of striking coins. As the press continues to strike more planchets, the grease can build up and even collect debris such as dust particles, fibers, lint, etc. All of this can become compacted in the recessed devices of the design. Sometimes, that part of the design will appear to be weakly-struck, and other times it will disappear completely. </p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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