If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension: 9 C! r0 R! F4 v3 ]: N " {5 k) X/ ]; D- m- [(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot + y5 i" E9 p" C & P4 d$ f( W6 `, o(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 T1 p$ D3 q. ] / v7 K! z R8 R7 `) t(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.