Flattening 3D cards
Is there any proven way to flatten 3D cards? I have a set of (I forget which) that are curled in arcshape that I bought in the late sixties. I keep reading that they will crack. etc. Also, I don't grade my stuff -- although I might in this situation -- but how do TPGers get them in holders? Is there some guarantee that they will remain "untarnished" thoughout that encased existence?
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