It's a fine thread but it looks strange. The threads are flat...they don't come to a point like normal. That's why I wondered if it was a weird thread. It could be that the threads are just damaged. I'll just have to try to match it up. Maybe I'll have to rig something up to make it work. The inner hole(inside the threads) measures 11/16. Maybe it was 5/8 and the threads pulled out?

I'm building my daughter a lowered "rat rod" Radio Flyer wagon. I want to use this old T handle on that. Building the frame right now. Bought a welder and I'm trying to learn as I go. Should be really cool when I'm done. I was just going to weld a bolt to the original handle tube and screw on this Hurst piece.