If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension: 2 x8 \5 {0 D I+ a; B$ [ # q$ ?) b0 P! N! x+ `7 k4 p' d# O(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot 2 y8 T1 }5 f8 _ " O3 m0 }! U+ Z0 i6 `- h% Z(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. 8 a( h7 f% ~1 j& X2 t2 T - O! c& s9 c! b0 w(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.