Thanks for the info guys. Being the inquisitive creature I am, I thought about trying to find out a little more about the origins of these bells and came across the following theory. Seems plausible to me:
WWII pilots started to carry there own bell and hung it in the cockpit to ward off the gremlins.
As these pilots came home from WWII many rode early Harleys and became Hells Angels and other groups they brought the bell tradition with them.
True???
