need help with 123 blower fan

[roy wood]

greetings, all! having the age-old problem with the seemingly
infamous 300D blower motor. made the mistake of buying "used"
replacement (i think it's older than the one i burned up). now looking at trying to replace the motor assembly. i saw a lengthy thread on how the brushes on these are victims of gravity and the only real solutions seem to be new unit or new
motor, if available. my problem is i'm mechanically uninclined enough to need help getting the fan blade off. i've tried pulling,
driving, unscrewing -- well, you get the picture.

any guidance on removal of the fan blade assembly from the
motor shaft would be appreciated. also any input on whether
anybody's been able to replace the motor without buying the
whole kit and kaboodle (the aforementioned thread seemed to
end last spring with no follow-up on the results).

mercy me!

ps -- it's a bosch motor.