I took great satisfaction tonight in fixing a Royal Quiet De Luxe whose owner brought it all the way from Toledo to Cincinnati for medical attention. It wasn't easy to remove the faulty part and install a good one from my parts machine, but after some delicate manipulation, the Royal was working again.
Here's your technical quiz:
What are these parts?
Which is the good one, and which is the bad one?
And what problem did the typewriter have?
I'll confirm the answers in the comments section in about 24 hours.