Flip cage upside down. Use a hair dryer to warm up the inside warped plastic. Place bricks or barbell weights on the warp area to flatten it. Might take a heck of alot of weight to do anything. Let the plastic cool. Keep repeating.

I had a Vision that I could not remove the glass because of a slight warp. I did the above and it worked well enough to get the glass out. I happened to have bricks in the backyard.. I probably wouldn't have bought them just for this.
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Mark

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