Hello John.
I am not sure how much help I can be for you and your friend, but I have copied your post into a new topic on the M170 in the Post-war Military Vehicles Thread where there are a lot more knowledgable people on this particular topic.
You might also want to look at the M38A1CDN2 Antenna Mast Assembly Thread under the same section of the Forum. It deals with some of the issues you raised as well.
David
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