There is also slight play in the nut side cam. Depending on what bias is needed, adjusting the belt from too loose to just right, the nut side cam will be slightly behind the the head side cam. Adjusting the belt from too tight to just right, the nut side cam will be follow but remain on the tighter side of play lag. This can also slightly change wheel/chassis alignment just a bit. I don't recall the shop manual recommending one way or the other for setting belt tension. Mine seems to track on the inside, I have gotten the belt to run in the center but the wheel is too far from proper chassis alignment for normal adjustment to correct. I now just live with the inside tracking.