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.)
That is exactly what I would do. Before you remove the motor, observe orientation. You can drill a hole on the "fender side" about 9 o'clock and no one will ever be the wiser. Try not to drill clear through, just "dimple". Then punch the rest of way with a sharp awl.
I used to lube HVAC blowers many of which are not supposed to be "lubable" this way, for years.
