I'd call that experiment confirmation bias Denny, I'm surprised that you would try the 'experiment' with such a lumpy bottle as a substitute for a smooth tire inner surface, especially the lumps and recesses in the bottom ... and that you think metal BB's have any similarity to tiny, perfectly round ceramic beads ohwell

I also note that the Counteract Brand that Ken uses is Canadian wink

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics