I messed up on my rpms and current on this motor when I posted this sometime back. Through the blocking diode and into a battery i have to spin it at about 1000 rpm to get charging voltage. I had it hooked to my lathe thru the diode and meters, 30 foot of wire to represent tower heighth and into a charged 12 volt car battery. I looked at the back of it where the 2 brushes are and it looks like it can accomadate a total of 4 brushes. can i put 2 more brushes in it and bring the cut in voltage down to about 500 rpm. Thanks JB