Do you have to use one of those compressor type stem caps on a fork with a carbon steer tube? I ask because my old frameset, which had a carbon fork with a carbon steerer, used one of those star nut assemblies. I now have a different frameset, and this one came with one of those compressor types. I assumed that the compressor part was to keep the stem from crushing the carbon steerer, but my old frame just had a regular old star nut. Anyone know anything about this?