I want to build a brushed DC motor but there are a few things that have confused me. I took apart a drill to get the motor out and the armature had a pair of drill holes on the face of a slot and another pair in the vicinity of the other two about 3 or 4 slots away, the assumption would be to self start in any position? Also, the conductors driving the armature were wound round a small core about 6 turns per conductor, why have they done this? For excitation I was thinking of seperately excited. Car battery for the armature, car battery for the field windings. I want my motor to be "beefy".