dieseldon and all,
The newer blower motors have the brushes exposed so that they can be replaced without disassemblying the motor. The only difficulty in replacing any of the brushes is obtaining the brushes or making new ones, plus soldering out old and in the new ones/ .
Any injection mold making shop will have scraps of carbon electrode material, which they'll probably give you for free and it can be used to make new brushes which if made correctly can be installed easier than the original ones. I made two sets recently this way and installed in both the new motor and the older sealed unit. I just drilled and tapped the outer end of the fabricated brush and then drilled another hole in the side so the wire could be inserted and a set screw tightened down with a little Locktite for good luck. Both worked fine! To get the original remmant off, I merely crushed it exposing the wire end. BTW, the carbon material can be easily fashioned into shape with 180 grit sandpaper.
On the other hand, if you don't always have to pretend you're on a dessert island you can order the brush set and the workbook describing how to do the job from,
www.**************.com.
He has a great booklet on vaccum systems too.
Check my website for a great Christmas gift for the hobbyist!
Good luck!
Ben
www.reproduce100s.com