you'd have to machine that cone first to get rid of the taper then put a die on it,,not cost effective! As mentioned it probably went thru something then washer and pin to affix.....
So 2 different attachment shapes, cone, that could be tapped OR drilled for pin,,, and a stud that could be threaded.
JR, you've studied these things and have written a monograph on them.You are the 'go to' eagle guy...How were they originally made? Have you had the material tested on the better of the fakes?,are they just aluminum? , thanks, G.
