Fixing power antenna, has anyone done it? Options

[Xander_X]

As I have yet to find a working power antenna, in the interim, I thought I may try to fix mine.

When I first got the car, the motor ran but the antenna would not move up and down. A very common issue with power antenna after years of use. Now, upon taking it apart, I basically just put it back together, but had to figure out how to put the ribbed plastic tether back in the motor. I had someone turn the radio off for me as I essentially "shoved" the end of the tether in it's respective whole in the motor assembly until I found the position it was supposed to go in. Once I did, the motor sucked it up and I tightened the antenna tube back into the motor assembly. It then would go up and down ... sort of. When it went down, it worked great, low motor noise, and motor stopped as soon as the antenna was all the way down. But on the way up, the motor was quiet until the antenna was all the way up, then it continued to make a louder almost grinding motor noise. So now, basically the main problem is, I'm trying to figure out why it's not recognizing that it's all the way up and stop the motor?