I'm glad you got that buzzing noise figured out dilbone. I know what you mean by pinging and clanging man! After I built mine running it down the road listening to everything and thinking to myself did you tighten this or that?! When I was building my bike, I used two scotch-brite pads for the spacing to the backbone. After everything was painted and going back together I used some leather like you did with the inner tube. I had that tank off many times with no sign of any problems. Bike sounds great man!