There are scopes that plug right into the usb port on your computor. Cheap. Stick a wite cloth in the end of the bore and then stock the scope in ghe other end. You can see everything. However, still cannot know how deep pitting is this way. But it may reveal it is not as bad as it looks.
Those scopes also work great for a do-it-yourself colonoscopy.
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B. Dudley
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