That is my thought as well – I am hopeful that John Barrett at Letterpress THings might have the replacement piece available in his warehouse.
I am also slightly concerned about the possibility of accidentally damaging the gooseneck in the process of removing it though. Apparently (and I quote) the Model “O” makes this a challenge as the shafts, if original are peened over at the the ends and will not pass through the parts without great care. I have no idea what peened means – aside from the possible double-entendre- but it does not sound simple.