In replacing the blower fan that was worn around the motor shaft, I noticed the fan had been rubbing against the left side of the rear (motor side) blower housing. The new fan does not rub the rear housing. However, when attaching the front blower cover, the fan rubs against the right side of it. Removing the fan and looking straight down at the motor and shaft, I see that it is not quite perpendicular to the motor assembly bracket to which the blower housing attaches. The bracket is secured to the bottom of the dryer at the front by two screws and, at the rear, by just a tab that slides into the bottom panel. There is slight play both vertically and horizontally at the rear of the bracket (perhaps from some not quite so gentle handling when recently moving of the unit :o ). I've found that securing two washers (about 1/8" total) beneath the right rear corner of the bracket that the motor and shaft are pretty close to perpendicular when the tension of the idler arm pulley is also attached via the belt.
I haven't tested it yet, but I wanted to ask the community whether 1) this sounds like a lasting fix or 2) I should try something else. Oh yeah, if I stick with the wedging solution, how should I prevent potential squeaking from the washers? I was planning on securing them with a screw into the bottom panel. There's already a hole for such in the bracket.
Thank you very much!

Update: Instead of shimming the motor bracket, I took it off with motor attached and bent it back in shape. Reassembled everything and working great for a few weeks now. I was getting a faint whistling sound that may have been from the vent or maybe the slippers settling in (?). Yesterday the heater suddenly wasn't igniting again! Turns out the electrical connector to one of the solenoids is very loose fitting and popped off from vibration of unit. A little electrical tape to adhere the connector to the solenoid bracket is working for now.