I think you just unbolt the whole power unit from inside the trunk, then kind of wiggle it out. If the mast is stuck halfway up, you will have to break it to get it out of the car.

Its been years since I have done it, but I remember it being pretty easy.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2