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<p>[QUOTE=&quot;Sholom, post: 603847, member: 17753&quot;]I understand those concerns . . . but in practice it&#039;s not a problem at all.</p><p><br /></p><p>Here&#039;s how I did it.</p><p><br /></p><p>1.&nbsp; I taped the lever/bar to the fulcrum first.&nbsp; It doesn&#039;t have to be in exactly the middle, see next step.</p><p><br /></p><p>2.&nbsp; I put a pre-1982 penny on one side (call it Side A), but not all the way at the end (as you can see in the picture).</p><p><br /></p><p>3.&nbsp; I tested various pennies on the other side, until I achieved the following result:&nbsp; when a pre-1982 penny is placed on Side-B (all the way at the end), the lever goes down with a thunk; when a post-1982 penny is placed on Side-B, nothing happens.</p><p><br /></p><p>4.&nbsp; If the desired result in #3 didn&#039;t happen, I kept moving the penny on Side-A -- i.e., through trial and error -- until I did get the result.</p><p><br /></p><p>The fact of the matter is this: although the differences in weight seems slight (2.5 g to 3.1 g), the copper penny actually weighs *over 20% more* than the zinc penny. This is more than enough tolerance to get the lever working properly.</p><p><br /></p><p>All I can do is tell you from experience -- I use my home made &quot;machine&quot; on all my 1982 cents, and the results are exceedingly unambiguous.&nbsp; Furthermore, with various people cleaning up (wife) and playing with stuff (kids), the &quot;machine&quot; often loses it&#039;s calibration <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" /> -- and it takes me all of 20 seconds or so to re-set it.[/QUOTE]</p><p><br /></p>

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