Hi Steve

I appreciate your help on this. I got an email from Skybeaux (Ken) and he thinks a tilt switch sound.

I checked out the video your thought and not quite the same sound, but then checked out a few more from the same guy and this video - http://youtu.be/LuFKrbVR92A - has a similar sound at the 2min 12 sec mark. I think it confirms a tilt sound as it appears the guy gives the machine a shake.

I will investigate late this arvo.

cheers