If you want to save money and the crack doesn't bother you, you can do the following to stop the cracking extension:$ l/ o- x0 X+ U" n. m
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(1) Buy a set-tube Epoxy (come with twin-tube to mix) at auto parts store or homedepot ; z" a6 P+ }. h# \: ~' d0 n4 X1 f9 n5 r : p" P4 V4 a# k% Q' _% i( B; V(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.+ L0 b( O4 Z# }4 v# y
) v0 `3 Y$ S, A6 U- x. B(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.