Welcome to the forum George. As for the cards sticking to screw downs, I have cards today that are stuck to them and will not come out without greatly damaging the cards. I don't make other holders either
. It does happen. If I were you I would consider putting them in top loaders....but then too, if nothing as happened to them for this long it might be good to leave well enough alone. I do like having my raw cards in penny sleeves and top loaders. They are just easy to handle that way. take care and good luck in the quest....