Thanks to Shoguns pointers I was able to make quick work of this project. I have a shrink wrap tubing heater I used to put a directed stream of hot air at the point where the metal shaft meets the plastic.
Twisting the cages in opposite directions and pulling gently I was able to remove the plastic fan easily. Once one was removed I used vise grips to twist the other one off after heating.
I reinstalled the motor and tested the unit. It was rubbing a little and after adjustment it was out of balance. I noticed the outer edge of the fan has several locations with dots of plastic just like a wheel weight. SO, I grabbed the fans and did 1/4 rotations until it was in balance.
I have heat again and can hardly wait for the snow!!
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