The red trim is no longer made, but you can buy the tan trim from a member of the club.  His name is Bill Edstrom and his email address is a007kirbyman@aol.com.  He owns a Kirby service center in Wisconsin.  He will give you a very fair price and he ships fast.  I've dealt with him often.  As noted above, you can paint the trim with plastic/vinyl paint.  I use SEM products. Here's the procedure I use:  1) wash the trim with soap and water.  2) Wipe it down with methyl ethyl ketone (MEK).  3) spray with SEM Sandless primer.  4) While the primer is wet, spray on the first coat of paint.  I think the color I've used in the past is "Portola Red" in SEM's plastic/vinyl paint line.  Let it dry for an hour and the spray again.  I then let it cure for about 4 days before stretching it onto the machine.  You can buy SEM paint online.  Hope this helps!

Wet sanding does a great job, but it's very labor intensive too.  If you find yourself doing quite a few, you may want to invest in a bench polisher.  If you click on my profile photo, you'll find a Model 560 (from 1960).  I painted all the trim on it.  The SEM plastic/vinyl paint is very durable.  It's often used to spray out plastic trim on cars, so it works well.  Please post photos!  I love work in progress photos! 

You can test the armature with an Ohm meter.  Just your multimeter to Ω (Ohms) and touch one lead to a segment on the commutator.  Touch the other lead to the adjacent segment.  The needle should move all the way to the right.  Keep repeating that for each segment.  If the needle doesn't move or doesn't move all the way to the right, then you have a bad or weak segment.  If that's the case, then it's time to toss the armature and probably the whole motor.  That one segment with a piece missing with case excess sparking, so the armature is toast anyway.   However, despite your motor problems, you did a very nice job of polishing it!