Hello, I recently replaced a 4:3 Da-Lite Model B screen with a 16:9 Model B Screen. However my new screen has a ripple. Can I ask for a replacement because of this, or it is considered inevitable with these kind of screens? Maybe I can get the 4:3 screen back. I will miss the top black bar, but thats not a big problem. Or would that screen develop ripples as well after some time anyways?