SECTION 3 All classes limited to one (1) motor in car/truck. *MOTOR: PROSLOT - VR-eXtreme NEO: PART NUMBER PS-4021, VR-20 NEO: PART NUMBER PS-4020, VR-12 NEO: PART NUMBER PS-4019 *CAN: Any cutting, welding or machine work prohibited. *END BELL: Hardware must be VR-Series. Clearance of hardware to commutator if close, Copper hardware permitted. Any cutting or machine work is prohibited. *MAGNETS: May be zapped, but must reside in original position in can (0.530" minimum air-gap (+/- 0.002"). Gluing and shimming of magnets for air-gap adjustment prohibited. *BRUSHES/SPRINGS: Any type of brushes may be used. Any springs may be used. Shunt wires permitted. *BEARINGS/BUSHINGS: Ball bearings allowed in classes that permit them. Bearings, and bushings may be epoxied or soldered in place. *ARMATURES: Truing of commutator and armature re-balanced permitted. Must meet the following specifications: *VR-eXtreme: Part Number PS-4023 Machine wound, 0.500 diameter. *VR-Group20: Part Number PS-4022 Machine wound, 0.500 diameter *VR-Group12: Part Number PS-4026 Machine wound, 0.500 diameter Click Here: For General Regulations. If there is any area of these rules which needs clarification, please contact CLUB (.400) Technical Director by e-mail at club400@hotmail.com.