The thread is Sae, the od of the threads is 14mm
I believe it was intended to be acme thread but they are not totally uniform.
I found a few posts where people had run into the same issue and had the threads measured at a place that had the proper gauges or ? And they ended up with the same thing. It’s a metric diameter rod that has 10tpi cut into it.
I’m going to mess with it this weekend and see how good of a fit I can come up with.