p.s. does it matter on which end of the eccentric the spindle/BB cups are (top or bottom of the cylinder)? If I target the crank spindle for centering position relative to top tube, there is more eccentric bb material on bottom or top (depending on which way I turn the spanner wrench), which affects my saddle height one way or the other. I wouldn't think either position has much, if any, effect on performance of the chain (sloping slightly up or down).