Dimitris, I agree that there is not much material for a set screw but I think it would hold.
One other method would be to use a hardened dowel or drill blank or shank from an old drill bit.
If you have a dremel type grinder with the small abrasive discs you could cut a groove in each end
of the dowel and use a snap ring or external retaining ring on each end of the dowel. Some method to
prevent rotation of the dowel would prevent wear in the hole in the arms. Loctite or thread locker might
work if the end of the dowel is a close fit to the hole in the arm.
Hope this helps,
Cheers, JR

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