Originally Posted by rpenmanparker

Actually the need for a perfect cut on the top of the steerer is much exaggerated. A hacksaw and a piece of masking tape as a visual guide are all that are needed to make the cut. Assuming the measurement has been made correctly, of course. The steerer top needs to sit 2-3 mm below the stem top or the spacers above the stem if you use them. Nothing touches the steerer top, so there is no reason it has to be perfect. The top cap of the headset rests above the steerer without touching it when properly set up. So slight irregularities in the top of the steerer are completely insignificant.