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leon'41 Playballs are a little new for me but I have done what you said with many other pre-war cards and always with good results. The main thing to remember is be gentle and DON'T rub hard at all....Rub lightly and slowly....be gentle....and I doubt you will have a problem....again, I have never tried it on a Playball and not sure how good (or bad) their stock is under pressure.....good luck and let us know how it turns out if you try it...regards