• Essential tool used to compress the clutch spring for removal and installation of the retainer ring during clutch replacement • 5/16" UNF internal thread for all XL models (1991 - 2005) • 7/16" UNF external thread for all Big Twin (1990 - 1997) • Includes all Buell ® (1991-2003) and Buell ® Blast (except 1125R) • OEM reference: 38515