Ritchey WCS Headset Compression Plug For Carbon Steerers Do you have a fork with a carbon steerer? Normally, you would use a starnut to keep your fork in place, but with a carbon steerer, you need a compression plug. The Ritchey Compression Plug and top cap are designed for forks with a carbon steerer. Features Designed for forks with a carbon steerer Comes with a compression plug and top cap Ritchey part number: 33055337001 | Ritchey | Wcs Headset Compression Plug Black