https://www.youtube.com/watch?v=QjR7dimpSJA Also beside Sprag Bearings are One Way Roller Bearings. I was always thinking bearing always rolled. The One Way Roller Bearing seen in video at 50 second mark shows inside what happens. This is just like the pawl clutch in the recoil starter. In the Sprag Bearing I wonder how the sprags not being round and rolling can have not too much friction, but they I guess made them some how to operate OK.