Originally Posted by
jonthebiker
When dropped in the top cap lies about 2 mm above the top of the stem and is not flush with the stem and that thin black metal plate at the top portion of the compression plug is therefore about even with the top of the stem, possibly a millimeter below the top.
If this is true then putting a 5mm above the stem won't work, you'll likely need to cut another 3-4mm off. With the right tool it's easy, I use a Nashbar fork guide which costs about $15, minus whatever Nashbar have off for the day (25% today apparently).
Nashbar Steerer Tube Cutting Guide
Using this tool I was able to cut 1mm off my fork, after my first cut left the tube slightly too long.