If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension: ! J! K0 \0 |& I6 r. U& a" n L - V1 ~2 h3 f2 J; ]$ L5 w(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot / B3 R/ a/ y9 t1 F 0 d& w) ?( b+ M' M(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. * H8 F u# ^3 v2 u4 i- g; V . s9 a- N; c! o+ P% M9 S6 S(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.