Invest in a borescope. Mine cost a whopping $48.00 on Ebay, fits through a 5MM hole, and it projects a full-screen image on my laptop with nothing but a USB plug-in and a disc in the DVD drive. It's got variable-intensity LED illumination and a mirror accessory for looking around corners. I can also capture screen shots directly to my "pictures" file with one mouse click if I want to study a screen shot in detail.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!