Tips for Flattening Curled Cards?

General
1

I recently picked up a great collection of Neo Gen Old back Japanese cards. I want to grade the holos but many of them are slightly curled.
(no bends or creases)

Has any one had success flattening cards?

Should I just stack on some heavy books and wait a month?

2

Yep. Just stick them under something heavy. They’ll flatten out after a little while.

3

Even sticking them in Card Savers flattens them out pretty well most times.

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4

textbooks work well

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