If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension: & _# ]9 p: F$ y( m8 D. j8 \+ C2 o+ X! m" \, W% Y7 g3 w2 r2 Z
(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot; `; G7 T" `) h, _1 m
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(2) To buy a round or square think-glass-disk with diameter or side length of 1 inch. If you can't find it, you can go 99 cents stores or dollartree to buy a large-clear-cloth-button at similar size. j: j) G! |9 Q+ Q" y# O& n; I
(3) Prepare Epoxy well, spread the paste to one side of the glass or button, attach it to the crack-upper-end from inside of windshield. Wait for 24 hrs. It'll be as solid as a rock and permanently stop the crack extension.