I got chastised for mentioning it, but you can lube them two ways.
1. you can take it all apart and lube the front and rear bushings (which is how I did mine)
2. you can shoot a little light oil on the bushing where the shaft comes out of it and drill a real small hole in that hump in the back center of the motor and get a drop or two in the rear bushing. (if you are not comfortable taking it all apart.)
I got chastised for suggesting the hole behind the rear bushing and "ruining" a factory blower motor. :D
It gives lube access to the rear bushing without even taking the motor out of the car and can be plugged afterwards with a small drop of RTV to keep dust out.
Some one was being a little more anal about it than I would.
It's usually the front bushing that makes all the noise though and a small shot of light oil did it going on almost three years now.
Never seen any info on rebuilding them, but there are new replacements somewhere since I recently saw a brand new one for sale on here.
