What Screamin said but might try it w the knob on zero & see if it acts good and can mark the dampener to get more than the tab will normally show you, use the spaces between the tab marks for a ruler to make addit'l marks on the dampener to the right (CW) from the O TDC slit or .0632683" is 1 deg so 1" around the circumference is 16 deg

live every 24 hour block of time like it's your last day on earth