Sorry for the delay
I just pulled mine apart. My Passenger side, the glass was snapped off it. So i didnt care how much i pulled it apart.
To put it straight, It looks like you will be buying a new mirror.
The bracket from the body is solid cast alloy, with a 2 pin locator on the bottom that the mirror end 30mm-ish pin section locates in. The mirror end of the pin spins/locates under pressure from the spring, Which a nut thing is riveted/crushed onto the shaft around the wire holding the spring in under pressure..Which sounds like your riveted nut has come off, or snapped. The small spring is very strong!
Very hard to describe. I have pics but my net is super slow atm.
PM'd.