This motor is assembled by Mick A of Slot Car City (over 19 years experience!) and Koford Engineering. Completely Blue Printed Motor set-up and Endbell by Koford. Mick A then radius the motor brushes with the Magnahone brush tool. The armature is faced off with the Magnahone Arm tool and inserted and checked to make sure it spins freely and magnets and Endbell parts are clear. The motor is then broken in on our motor analyzer for the final check and to make sure the motor brushes are seated properly. When you receive this motor just solder on the pinion and solder it into your car and your ready to go racing!