To maintain peak performance the bearing assemblies on the Shuttle Xtreme can be replaced by the user in just 4 steps with the new Cable Xtreme Service Kit or Rebuild Pack. The Xtreme Service Kit (SKU SM156309) comes with all the necessary parts and tools needed to rebuild a single unit. The Xtreme Rebuild Pack (SKU SM156308) comes with all the parts needed to rebuild up to 10 pulleys (tools not included).