Quote:
Originally posted by thedieter:
My question is, what determines if they should be replaced?
I have a tiny crack that I stopped by stop drilling just ahead of it.
Is there any other criteria to tell if they are defective?
The 1/4" between the ends don't seem to be a problem, it is a Hummer after all.
Best regards, Happy Jack 
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They start out as tiny cracks, and the A-pillar should fit up to the roof rails.