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Re: 50 years ago I was given this USAF 54 3100
you have the upper joint upside down (or maybe just the set screws), the long screw goes through the one side hole in the column D, locking it two directions.
you dont need to drill all the way through the shafts, just a small divot is fine. my experience with exactly those same parts is that they are mild steel and easily drilled and cut, so your drill bits may be dull or need oil.
if that is the length you are working with you will want to shorten the collapsible shaft about 3-4 inches, otherwise its not going to be collapsible, right? also the benefit of a collapsible shaft is with install, you can collapse it then extend it to install. to cut the shaft I use a die grinder.
nice work, keep plugging away!
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