USB Borescope discovery - transfer port alignment

Rough or tight spot in the barrel leading, or just in between scrub downs?

Very neat video, thanks once again.

Great question Chuck. I have not done any cleaning since getting the scope. My plan is to put small marks (or pieces of tape on the borescope to mark where the leading begins and ends and then do another light cleaning with Ballistol and my patchworm and see if they can be removed.