Thank you, all, for your help.
One other question:
The brush holders on the Pullmor in my Turbine have a round hole in the end, rather than a slot. I believe that the brush holders with a slot can be screwed off, so that you can replace the brushes without removing the brush plate. Can the brush holders with a round hole in the end be screwed off, or are they fixed, necessitating removal of the brush plate to replace the brushes? (I don't want to "force the issue" to find out.)
Cheers!
Keith