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Old August 19, 2013, 04:44 PM   #31
Senior Member
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,024
Just using the brush followed by sighting down the bore with a backlight at the other end worked well enough as an initial indicator for me. I didn't have a borescope at the time I first discovered this effect.
I would be happier with a close-up picture through a magnifying bore scope. I hope you don't mind if I do not want to take your word for it. I want to see it for myself.
dahermit is offline  
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