Drivers Side Window Is Backwards-Up is Down/Down Is Up On The Switch

My drivers window all of a sudden stop working in the down position. I checked the switch with a test light. Switch had power and ground was the ground was good. I had power at the motor. I figured something was wrong with the motor. I bought the truck new in 2001 and the window motors are original and never been touched. I removed the four screws to the cover, removed the drive from the regulator to check the armature. The cover had graphite looking flakes in it. I cleaned this stuff out of the cover. I cleaned the armature with fine emory cloth and used contact cleaner when I was finished. I noticed on one of the brushes that I could see the braided copper was exposed on the worn side. I rotated this brush so that he thicker side was on the armature. After many tries I finally got it back together. The motor works, but it is backwards. The up position on the switch makes the window go down and the down position makes it go up. The automatic down is now automatic up. What did I do wrong to make the window be backwards? Thank you in advance for your help.