Nice work. Curious as to the source of the tin.
It was a metal box used to store air rifle pellets
Heres the result from the telephone pick-up which was a great success. The first 25 seconds of the clip you hear exactly how it sounds when recorded on the camera. After 25 seconds I put the audio through some small editing to create stereo and I tried to remove that high pitch tone.
http://luftfartsfag.no/example3.wma
But when it came to the potentiometer, it wasn't as simple. It was hard to find the right setting because it wasn't possible to listen to the recording while in the aircraft due to the noise. I thought I'd found it by looking at the readings on my camera but you can hear what I ended up with here:
http://luftfartsfag.no/example4.wma
I'm guessing the low volume is a result of me setting to much resistance in the pot, and I just need to find the sweet spot between having to much or to little.