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<p>[QUOTE=&quot;physics-fan3.14, post: 2550907, member: 19165&quot;]It is very likely that the coin was inserted into the prongs slightly crooked when PCGS assembled the slab. I&#039;ve had it happen before. It probably didn&#039;t actually slip, and will probably be held just fine once corrected. The plastic is usually just a bit tight, and will hold the coin just fine. If you can correct it yourself, it is much cheaper than a reholder. </p><p><br /></p><p><br /></p><p><br /></p><p>I would be more concerned that freezing the slab will cause the plastic to become more brittle. Any smacking or thwacking with a brittle plastic will cause it to crack. </p><p><br /></p><p>As for the OP - I&#039;ve had coins a bit crooked in prongs before. It may sound brutal, but seriously all you need to do is slam the face of the slab on a desk (try and get the face as level as you can - you don&#039;t want to slam just a corner, because you will damage your desk, and crack the slab). You want to evenly distribute the force across the entire face of the slab. </p><p><br /></p><p>Your legal pad didn&#039;t do anything because it is not a hard surface. You need a hard surface like a desk, counter, or table top - the legal pad and seat absorbed all of the force, instead of transferring it to the slab. </p><p><br /></p><p>And also, you want to do it upside down - that is, opposite of the actual direction you want the coin to move.[/QUOTE]</p><p><br /></p>

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