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Everyone should have a borescope. Absolutely invaluable in situations like this (or about a million others).
I use mine all the time.
I also have that USB camera endoscope that healthservices linked above and it works just fine. It's a little more awkward to need to have your laptop with you to view the image, but not terribly inconvenient.
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Last edited by particlewave; 03-25-2015 at 11:18 AM.
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