If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension: , Q) [: `) X( u5 e P; Z2 u* I- i. K* E
(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot7 ~- M( l h) L4 M
% d9 z$ V8 F9 U% H(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.$ W9 m+ v& K8 r' r) b5 ~8 }& m9 z
8 k% j6 L# H9 U7 B4 e(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.