TubeNet

I bought a cheap borescope because I wanted to do valve alignment. Plugged it in, got it to show on VLC, put the cam in the tuba. I couldn't tell snakes from dildos on the thing. It's going back to ebay and I'm getting my $13 back! Even in a non-challenging shot it looked worse than the early novelty cheap digital cameras...I thought it had a chance now that webcam tech is ubiquitous, oh well.

Can anybody recommend a borescope that works inside a tuba? And it has to cost less than aligning 6 valves.