kenmore elec dryer

I have looked up this model and the only response is commercial. as i looked at the parts they are the same for my unit. i ordered a replacement motor per the testing. In order to replace the motor i need to remove the air impeller. instructions said to use a 1/2 in socket drive. it fit perfect. problem is the plastic caved in. probably too tight from some one. now my delema is what do i do with an impellar that i can not unscrew from the shaft, there for I can not remove the motor for replacement. and the pic looks some different for the replacement part than the one i have. any help out there in cyber land?:mad: :mad: