The quick fix for oversized screw holes is a product called Marine-tex it builds and repairs holes and cracks in plastic. It will bond with the plastic of the cooler and will help you re-tap the screw hole. Simply fill the oversized hole with the Marine-Tex, screw in the #8 5/8 pan head screw while the putty is soft. Then just allow it to harden. This process will fill, re-enforce your cooler and will allow you to reuse the same stainless steel screw over and over again.
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