At least you dont know how yours happened. Fitting the windwings recently and you guessed it screwed in too far and "crack" Crack went about 3" down, rang everywhere to get crack filled but nobody wanted to know about a cobra screen. Then I found a local guy who had owned a Robnell here in Melb that repairs screens and he was happy to help. Spent about 2hours getting it right and charged me $50 it was xmas eve also. He said its a pretty big job to change screen as the frame has to be dismantled etc.
Hope you dont have any dramas with it
Leeroy