Modelcraft free running sleeves modelcraft hfl 0822 these sleeves have low radial height and double bearings either with integrated sintered bushings or needle cages this means that no additional bearings are required these sleeves are used as switching elements return stops overrunning clutches etc the sleeves should be fitted using a driver the collar of which comes into contact with the end marked with the abbreviations modelcraft hfl 0822 free running sleeve 12mm od 8mm bore 22m w