As Doug suggested, I would just use something to push against the bow in the direction you want. I am sure you could get a nice piece of plywood and attach to the inside of the cage where the bow is, then place supports on the corners to push the bow out too. May not look pretty, but it would work. I have a double sliding door cage I bought from another manufacturer that must be warping and the doors are sticking badly even after I clean out the tracks. I think as more and more of these PVC and other plastic cages stay on the market, more and more "problems" with long term use will occur. The old neodesha slant cages looked pretty hardy and not prone to warp or bow. The vision cages look hardy too and I the person must have had ALOT of weight on it to cause this. As a precaution I always place spacer boards along the front and back of my pvc cages and racks I stack on top of one another. You can even tell that extra weight on the racks designed to be stackabable may cause the boxes to stick.

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