This job was a 3 point hitch off a potato tractor. They'd used it for 30 years. The end broke off and they needed a new one.
After trying to figure out how the thing came apart and losing my shit I broke it loose and was able to unscrew it.
Those are threads
I cleaned em up to get a thread count and size
I made a new shaft
and a coupler
Got it all back together and the old guy that brought it to me couldn't believe the link was adjustable. He went home put it on came back and gave us a bunch of potatoes as a tip. He was super excited he could adjust the height of the hitch with the link rather than unhooking it and adjusting the link to a different hole. Crazy 30 years who new.