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wrote in
oups.com:

voltage across the motor suggests worn out brushes or some other
electrical open circuit.

Me, too! He could also have a disconnected segment in the commutator, an
open winding in the armature. He probably can force it past this bad
segment because of a worm drive driving the capstan, unless he can get to
the motor armature to turn it by hand.

The motor is open, not drawing current. Take the motor out and take it to
a starter/generator rebuild shop and ask them if they can fix it. They
might be able to repair it, even while you watch.