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Judge Dred (Fred)Is it a fart if a bear farts in the woods and nobody hears it? If you follow the logic then NO it wouldn't be a problem because you wouldn't know the crease was there to begin with. On the other hand, I wouldn't like to purchase a card where a crease was removed only to have it come back again.
I wouldn't do it because I'd be afraid of damaging the card. There are people that can do it. I've seen it done but I don't subscribe to doing it myself.