Image Unavailable, Please Login I found today exactly why this frame piece cracks. It's because of that bar that should go rearward when the top is opened. When it doesn't, this frame piece impacts it rather hard when it flops over at the 90 degree point. The bar moves back because of the elastic band built into the headliner. For anyone that's had problems with the bar not moving backwards, check to see if you have cracks in this frame piece. The solution is to replace the elastic bands that move the bar, or if you're a purist, replace the headliner. If you don't know what the bar is, then it's very likely your top is functioning properly up to now.