Messing around with details, I managed to get the trunnions cut to length and capped to restrict lateral movement.

Firefly’s balance is easily adjustable within a range sensible for good shooting.   The square headed nuts are a concession to modern fastening techniques and the need to disassemble the machine as required to make progress on new designs.    From what I’ve seen of Roman metalworking,  it would be pretty easy for them to use heavy rivets in place of the nuts and bolts seen here.    When we finally settle on an ideal balance point, perhaps I will make up a simpler, non adjusting version of the trunnion bracket.  Occam would prefer that;  parsimonious little fashionista, that he is.

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