Mine has not stayed tight. Good idea to bend it - I'll try to remember next time it is cool enough. I was pleased that despite what appears to be larger openings in the screen that the cat doesn't clog any faster. I noticed a marked difference in wide-open draft with the new screen (compared to a semi-clogged original one). And I saw on the Woodstock web site that they recommend alternating the flow through the cat each time (I was meticulously replacing it the same way each time).