Taka's "counterpoint" about the Ultranator

[TM]

Orin-
Thank you for correcting my terminology- several others knew what
I meant by commutator, but I hope I wasn't muddying everything up
by calling it the wrong thing if it's called a collector ring.

As for the wear comment, Bosch rebuilds replace the ring entirely with
a new one- I have heard from several people (incl. my mechanic) that
other rebuilders may merely machine the ring smooth.

Why would they do this if there is no advantage?

Taka