Pushbutton Autochuck Rotor for latest model SIROBoost and SIRO T3 Racer 30 watt Models. Replacement sub-assembly. Bearings not included.. Replacement rotor autochuck mechanism with "motion activation" technology. The spindle housing has been further improved by hardening the steel to withstand numerous rebuilds and overhauls. Each rotor is serialized and carries a 9-month warranty. Made in USA
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