1995 325is E36 Window arm off track

When it was really cold out a few months ago I tried to roll the window down. It was frozen shut and the motor in the door ripped the moving
arm from the track attached to the window. So I took apart the door and reconnected the motorized arm to the track (presumably saving myself $200). But the connection didn't stay. After about 2 weeks of using the window the motorized arm and the sliding track it attaches to came apart again. I am assuming they came apart because I couldn't get the cotter pin in to hold it all together.
So I have 2 questions.
1. How do I disconnect the speaker wire from the speaker? It seems like its a simple snap-in but I can not figure it out for the life of me.
2. How do I get that damn little cotter pin in position to hold the motorized arm attached to the sliding track?
Any help in this matter will be greatly appreciated. Thanks.
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