Thanks, Jurgen, your efforts are appreciated.
Just so you know.....The motor, though a bit stiff,
ran the first time I tried it (train DC transformer).
Now to carefully clean it up to improve the performance
range and then experiment. Maybe add a couple of neodymium
magnets to it. Maybe see if I can turn it into a dynamo,
with no permanent changes of course.
Another question. The grinder accessory has, on the shaft
end without the grinding wheel, a flat protrusion of the
axle, maybe 1cm long. What is its purpose?
Wayne