Cox Model Engine Handbook. Corrections?

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I'm certainly not impugning the authors work, but coming from a publishing background I know that it's the rare manuscript that makes it to the book binder that does not contain some sort of factual, statistical, or typographical error.  My contributions here are full of them.  

I'm sure that Mr. Dannels and Mr. Sitter and their proof readers did their research.  But there are so many Cox engine enthusiasts here with scads of hands on experiences with these products that something untoward might have surfaced since publication.  

One could spend a considerable amount of time just reviewing the cylinder/back plate/crankcase sections, but what caught my eye was the little column on prop drivers, throttle stops, and counterweights.  Looking at one of my Cox engines last week I noticed for the first time what appeared to be a brass prop drive, can't be I thought.  Yes, can be.  

As for the Pop Quiz, I'm passing too.  

Bob