Joe - I often do things to pennants that no sane person would attempt. I've been lucky with getting good results and not exacerbating any problems. I don't own a steamer but that might be your best best. Straight water from a spray bottle might help the stiffness, too. Bottom line, I wouldn't be worried using any "water" method and/or an iron on low. Keep us posted!
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if you can help with SF Giants items (no cards), let me send you my wantlist!
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