Ken
Pair
That is an interesting idea. However, it has an easy substitute for temporary use called "book". You can borrow "book" at the library.Anyone try one of these? (not my listing)
https://www.ebay.com/itm/Acrylic-Pl...545176&hash=item3d3ad7e3d5:g:Y3IAAOSw2xlanj~d
Seriously, I might just build something like that for holding several decks for flattening.
I have found that the cards warp way less if stored cool and dry. I kept some cards in a filing cabinet in my office and others in my garage and the garage stored ones all warp after a couple of years stored while the cool/dry ones in the office are better. I have setups never used in both storage places for comparison.