20005 - New Hex-Socket Flywheels (fits 2.0 mm motor shafts)

#20005 - New Hex-Socket Flywheels, slip fit, attach with #20010 flywheel cement

Part #12032 Hex Drive Couplings is needed to hookup flywheels and part    #12033 Hex Drive Worm Couplings are also needed to hookup hex drive couplings to worm gear on locos that used ball couplings and did not use hex couplings originally.