actually, regarding that pic above from sheldon's site
you wouldn;t want to make the edges of that filed down area so rough, but instead make it smooth, in order to have an opportunity to spin the axle little by little - which is actually your goaal now, innit? :)
actually, regarding that pic above from sheldon's site
you wouldn;t want to make the edges of that filed down area so rough, but instead make it smooth, in order to have an opportunity to spin the axle little by little - which is actually your goaal now, innit? :)