As a general rule of thumb, you always want to keep an eye on your rear plastic window when it folds and make sure its not binding. Mine binds (i.e. doens't fold straight) everytime i put it down, and I generally will not put it down unless it's over 60 degrees. I stop it half way everytime, get out and tap it in the middle so that it folds straight. The one time i Ignored it the binding will put a little gash in it as it tries to straighten itself out and eventually I can see that causing it to crack. Also the warmer it is out the softer the top is and the better it will fold. Glass would sure be a nice upgrade, even though it's about 1/2 the size of the plastic one....
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