(AMMCO #90-9800-5). Accuturn, Bosch, All Tool, Ammco, Coats, FMC, John Bean, Hennessy, Hunter, Kwikway, Hofmann, Snap-On, Van Norman, etc. Heavy Duty "Spring" Style Rotor Silencer Assembly for dampening harmonic vibrations created during the cutting process, the original four spring Ammco number is #909800 but we have added a 5th spring.
