The screwdowns will still press the card ends if they're overtightened, unless it's a type with a recess.
Another option would be cutting a frame like one of the SGC gaskets from acid free stock and using that in a screwdown. As long as it's thicker than the card there shouldn't be any problem.
I keep most of mine in toploaders with sleeves. Or just sleeves if the card is really beat like most of the star cards I have.
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