Above are illustrations of how most other windshield repair systems work. First by climbing on the hood of the car to align a jig fixture over the damaged area and position a chemical reservoir. The fixture is called a bridge assembly. The Bridge Assembly is held to the glass
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surface with a huge suction cup, which is counter balanced with machine screw dials. Now comes the threaded cylinder that is screwed thru the Bridge Assembly compressing a rubber O ring directly over the crack. The cylinder acts as the
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reservoir for the chemical that gets forced into the damage by a threaded piston dial. If the O ring is pressed down too tight by the threaded cylinder, the cracks close, or worse travel and destroy the whole windshield glass.
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